Summer Wedding Guest Formal Dresses
Serving looks hotter than the dance floor? You know it. Our summer wedding guest formal dresses are here to make you the best-dressed plus one—no bouquet catch required. Whether you're RSVP-ing for a rooftop soirée or a dreamy garden ceremony, these dresses bring main character energy with every twirl, toast, and Insta story. Get ready to turn heads and break hearts—because showing up in style is basically your superpower.
$59.90
A mauve floral mesh mermaid dress with a lace-up back, high slit, and floor-length hem.
$59.90
A lime yellow formal mermaid dress with ruched mesh design and adjustable spaghetti straps.
$9.97 $54.90 82% off
A luxurious burgundy satin gown with a high slit and cowl neckline for formal occasions.
$42.90
A sleek sage midi dress with a sleeveless cowl neckline and chic high front slit.
$64.90
A dreamy pink strapless mesh dress with asymmetrical ruffles and a high side slit.
$69.90
A green satin formal dress featuring a cowl neckline, high slit, and slim-fit silhouette.
$69.90
A captivating denim satin formal dress featuring an off-the-shoulder neckline and alluring front wrap slit.
$69.90
A blue floral crepe mermaid dress with a high slit, sweetheart neckline, and corset bodice.
$49.90
A black crepe formal dress featuring a sleeveless square neckline and a high-cut front slit.
$54.90
An ivory satin midi dress with a corset seam bodice and pleated faux wrap hem.
$69.90
A lavender mesh off-the-shoulder dress with ruched seams and a mermaid silhouette for formal events.
$29.97 $74.90 60% off
A glamorous gold satin formal dress featuring a V-neckline, waist cutout, and high side slit.
$79.90
A light blue mesh mermaid gown with faux pearl embellishments and a flattering sweetheart cowl neckline.
$59.90
A dazzling yellow glitter knit formal dress with a high slit and floor-length silhouette.
$109.90
An elegant yellow satin A-line gown with a cold shoulder design and sultry front slit.
$79.90
A yellow floral sequin mesh formal dress with a lace-up back and high side slit.
$79.90
An elegant wine satin dress with intricate embroidery, beaded accents, and a flattering curve-hugging silhouette.
$74.90
An elegant black mermaid dress with a glitter knit fabric and off-the-shoulder sweetheart neckline.
$59.90
A navy blue strapless column dress in slinky knit fabric with pleated seams and a high side slit.
$69.90
A brown mermaid formal dress featuring a halter V-neckline and open back in smooth knit fabric.
$64.90
A green knit mermaid dress with a cowl neckline, spaghetti straps, and a high front slit.
$59.90
A chic lavender satin dress with a form-fitting silhouette and high slit for upscale events.
$39.90
A chic black crepe wrap dress with a high slit, adjustable straps, and ruched detailing.
$54.90
A lavender mesh corset column dress featuring a sweetheart neckline and high-side slit for elegance.
$109.90 - $149.90
A yellow mermaid dress with sequin-scroll pattern, V-neckline, and lace-up back for formal events.
$109.90
A dazzling yellow sequin-embroidered mesh dress with a mermaid silhouette and adjustable spaghetti straps.
$77 $109.90 30% off
A stunning green sequin scroll dress with a lace-up back and mermaid silhouette for formal events.
$119.90
A glamorous yellow mermaid dress featuring a sequin scroll pattern and an alluring lace-up back.
$49.90
A coral satin mermaid dress featuring a lace-up back, high slit, and adjustable spaghetti straps.
$69.90
A stunning denim satin mermaid dress with a strapless sweetheart neckline and floor-sweeping hem.
$109.90
A stunning black sequin dress featuring a lace-up back, sweetheart neckline, and high front slit.
$64.90
A sage satin mermaid dress with a lace-up back and elegant floor-length hem.
$89.90
A glamorous yellow mermaid dress with glitter knit fabric, ruching, and a stylish back cutout.
$89.90
An orange bodycon dress with glitter polka dots, lace-up back, and adjustable spaghetti straps.
$69.90
A mauve glitter mermaid dress with adjustable straps, perfect for weddings and formal events.
$159.90
A stunning yellow strapless formal dress with beaded mesh fabric and a high front slit.
$119.90
A stunning royal blue satin dress with sequin scrolls, lace-up back, and a dramatic front slit.
$59.90
A sleek eggplant column dress with a cutout accent and high side slit for sultry allure.
$99.90
An elegant navy blue satin dress with a lace-up back and high slit for formal occasions.
$62.90
A chic green mermaid dress featuring a cold-shoulder design, sweetheart neckline, and high front slit.
$29.97 $109.90 73% off
An orange sequin bodycon dress with a high neckline, open back, and high front slit.
$69.90
A sage satin strapless column dress with a chic pleated neckline and high side slit.
$89.90
A sultry green satin mermaid dress featuring a lace corset bodice and high front slit.
$79.90
A sultry navy blue mermaid dress featuring a lace open back and side ruched seams.
$54.90
An ivory floral satin dress with a lace-up back and flirty A-line silhouette.
$59.90
A lavender knit column dress with a cowl neckline, lace-up back, and dramatic high front slit.
$49.90
A radiant red satin midi dress with a corset bodice, adjustable straps, and a wrap slit.
$79.90
A lavender satin A-line formal dress featuring a chic tie-back and high front slit.
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Chic and glamorous, the Rowena sequin mermaid long dress will stylishly elevate your formal night-out look. With a lace-up strap design and fitted mermaid silhouette with a high slit, you'll deliver stunning style. Fit & FeaturesSheer mesh fabric, knit lining, moderate stretch, embroidered sequin scroll design, Sleeveless square neckline, padded bust, Spaghetti straps, open back, lace-up strap design, tie closure, Lower back zipper with hook and eye closure, High waist seam, Fitted floor-length mermaid silhouette, high front slit, Runs true to size, Where to Wear:Prom, black-tie parties and galas, fancy engagement parties Free Shipping on All Orders Over $75. | Windsor Rowena Sequin Mermaid Dress in Navy Blue | Size: M | Knit Fabric/Mesh Fabric/Sheer Mesh Fabric
Windsor Lola Formal High Slit Glitzy Glitter Dress in Navy Blue
$29.97 $59.90
50% off
Flaunt your glam style in the fabulous Lola high slit glitter dress! She features a trendy cowl neckline with a slim-fit bodice, a floor-sweeping silhouette with a sultry high side slit to elongate your legs, and a form-hugging fit. She is composed of glitzy glitter knit fabric that offers a curve-hugging fit with a moderate stretch. Pair this gorgeous long dress with a sleek ring set to add some glamour to your look for your special occasion. Fit & FeaturesCowl neckline, spaghetti straps, Slim-fit bodice, form-hugging fit, Floor-length silhouette, Thigh-high side slit, Glitter knit fabric, mini-length inner knit lining, moderate stretch, Sticky bra recommended, Runs true to size, The saturation of glitter varies. Glitter may transfer. Free Shipping on All Orders Over $75. | Windsor Lola Formal High Slit Glitzy Glitter Dress in Navy Blue | Size: L | Knit Fabric
Effortlessly elegant, the Sophie glitter knit mermaid dress would be a stunning choice for a formal gala. She features a square neckline, short puff sleeves, a partially open back with a lace-up strappy design for a customized fit, a high waist seam, a floor-length hem, and a mermaid silhouette with a high front slit to showcase your heels. The glitter knit fabric offers a moderate stretch. Complete the look in this long dress with rhinestone statement earrings. Fit & FeaturesSquare neckline, Short puff sleeves, Open back, lace-up strappy design, tie closure, High waist seam, Floor-length hem, mermaid silhouette, front slit, Glitter knit fabric, moderate stretch, Sticky bra or pasties recommended, Runs true to size, Free Shipping on All Orders Over $75. | Windsor Sophie Glitter Knit Mermaid Dress in Navy Blue | Size: S | Knit Fabric/Rhinestone
The Gwendolyn glitter knit bow-back mermaid dress will have you sparkling up the night with a glamorous allure. She features a sleeveless square neckline, a bold backless design, a high waist seam, a chic bow accent at the lower back with a flowy floor-length train, a floor-sweeping hem with a mermaid silhouette, and a form-hugging fit. Style this long dress with a rhinestone clutch for a black-tie wedding. Fit & FeaturesSleeveless square neckline, spaghetti straps, Backless design, high waist seam, Bow-back accent, floor-length train, Floor-sweeping hem, mermaid silhouette, Form-hugging fit, Glitter knit fabric, Sticky bra or pasties recommended, Runs true to size, Free Shipping on All Orders Over $75. | Windsor Gwendolyn Glitter Knit Bow-Back Mermaid Dress in Light Blue | Size: L | Knit Fabric/Rhinestone
The Lucille formal satin dress will have you looking and feeling radiant and luxe! The dress captivates with a lace-up back, mermaid silhouette, and high front slit for effortless allure. Fit & FeaturesLined satin knit fabric, minimal stretch, Sleeveless square neckline, padded bust, adjustable spaghetti straps, Open lace-up back design, zipper and hook-eye closure, Fitted bodice, front ruched seam, high-cut slit, Mermaid silhouette, floor-length hem, Runs true to size, Where to Wear:Prom, weddings, bridesmaids, black tie galas, red-carpet events, nights at the opera or theatre, big milestone celebrations Free Shipping on All Orders Over $75. | Windsor Lucille Formal Satin Mermaid Dress in Coral | Size: L | Knit Fabric/Satin Fabric
Spend an evening in the timeless elegance of the Alicia floor-length formal dress and feel like a work of art! The side ruched seams accentuate your curves along the mermaid silhouette, and the high front slit adds a touch of drama to the floor-length hem. Fit & FeaturesSmooth knit fabric lined with stretchy knit, Padded bra cups, Back zipper and hook-eye closure, High front slit, Mermaid silhouette, Runs true to size, Where to Wear:Prom, galas, black tie parties, weddings, bridesmaids, nights at the theatre and opera, red-carpets Free Shipping on All Orders Over $75. | Windsor Alicia Off-The-Shoulder Mermaid Formal Dress in Green | Size: S | Knit Fabric
Make it an elegant entrance in the Priscilla formal satin dress with a curve-hugging mermaid silhouette and floor-sweeping hem for dramatic flair. Fit & FeaturesLined silky satin fabric, minimal stretch, Strapless sweetheart neckline, Pleated, lightly padded bust, non-slip grip lining, Slim-fit bodice, high waist seam, hip-hugging fit, Floor-sweeping hem, mermaid silhouette, Runs true to size, Where to Wear:Prom, weddings, bridesmaids, black-tie galas and events, and fancy milestone celebrations. Free Shipping on All Orders Over $75. | Windsor Priscilla Formal Satin Strapless Mermaid Dress in Taupe | Size: M | Satin Fabric
Sleek and sultry, the Kathie formal satin dress is destined to shine at banquets, galas, and black-tie weddings! She features a sophisticated one-shoulder neckline, a wide shoulder strap, a pleated side seam, a mermaid silhouette, and an asymmetrical high front slit along her graceful long hem. The formal dress is composed of luxurious satin-lined fabric with a sheen effect and minimal stretch. Complete the look with hoop earrings. Fit & FeaturesOne-shoulder neckline, wide shoulder strap, Back zipper and hook-eye closure, Pleated side seam, asymmetrical high front slit, Mermaid silhouette, long hem, Lined silky satin fabric, sheen effect, minimal stretch, Strapless bra or pasties recommended, Runs true to size, Free Shipping on All Orders Over $75. | Windsor Kathie Formal Satin One-Shoulder Dress in Gold-2 | Size: M | Satin Fabric
Stun in the Shay formal glitter dress that makes your entrance that much more glam! Shay features a mermaid silhouette that flaunts your beautiful curves and a floor-length hem for a hint of drama. Fit & FeaturesLine glitter lurex fabric, V-neckline, padded bra cups, Adjustable spaghetti straps, Ruching, mermaid silhouette, Wide banded hem, train , Runs true to size, Extra glitter for maximum sparkle - may have some natural fallout , Where to Wear: Prom, black tie galas and events, red-carpet events, upscale birthdays Free Shipping on All Orders Over $75. | Windsor Shay Formal Lurex Glitter Dress in Rose Gold | Size: XS
Radiate sexy elegance in the Deyna formal long dress perfect for your upcoming black tie soirees! The dress accentuates your curves with side ruched seams and mermaid silhouette create a stunning and flattering shape, while the floor-length hem adds sophistication. Fit & FeaturesAiry mesh fabric, full knit stretchy lining, Off-the-shoulder neckline, ruffled cuffs, cascading ruffles, Back zipper and hook-eye closure, Flexible boning inserts in the bodice, Side ruched seams, mermaid silhouette, floor-length hem, Runs true to size, Where to Wear:Prom, weddings, fancy garden parties, and dressed-up events. Free Shipping on All Orders Over $75. | Windsor Deyna Formal Mesh Off-The-Shoulder Long Dress in Periwinkle | Size: L | Knit Fabric/Mesh Fabric/Mesh Fabric
Summer Wedding Guest Formal Dresses
When it comes to being the best-dressed guest, nothing beats the thrill of slipping into a formal summer wedding dress that makes you feel like you own the dance floor—yes, even if you’re just there for the open bar and the cake. There’s something electric about a wedding in June: the sun lingers a little longer, the air is thick with excitement, and every detail is dialed up to max glam. That’s why choosing from the latest windsor wedding guest dresses is basically a rite of passage for the girl who knows how to make an entrance. Whether you’re RSVPing to your cousin’s black-tie soirée, your bestie’s garden bash, or that destination wedding you’ve been counting down to since the save-the-date hit your inbox, the right summer formal dress for wedding festivities will have you feeling like the main character from the moment you step onto the scene. Picture yourself swirling through a sea of fairy lights, your dress catching every golden hour glow, the compliments rolling in faster than the champagne pours—because when you look this good, you can’t help but radiate confidence.
Picking the perfect formal summer wedding guest look isn’t just about following a dress code—it’s about curating a vibe that’s all you. Think airy, flowy fabrics that let you twirl without a care, statement necklines that frame your face just so, and colors that pop against sun-kissed skin. It’s the little details that make all the difference: a daring slit that lets you show off those dance moves, a subtle shimmer that catches the light as you toast to the happy couple, or an open back that turns heads with every step. And let’s not forget the practical magic of a dress that keeps you cool and comfortable, even when the party heats up. These summer formal dresses for wedding celebrations aren’t just for the ‘gram—they’re made for memory-making, from the heartfelt ceremony tears to the wild after-party laughs. If you’re shopping for yourself or hunting down the ultimate gift for your ride-or-die who’s got a packed wedding season ahead, these pieces are the ultimate confidence boosters. They’re the kind of dresses that make you want to RSVP “yes” to every invite, just for an excuse to wear them again.
Every formal summer wedding guest deserves a look that feels as unforgettable as the day itself, and Windsor is here to make sure you never blend into the background. Whether you’re going for classic elegance, bold drama, or flirty fun, there’s a style here that’ll have you feeling like you could catch the bouquet (or at least catch someone’s eye). And if you’re already dreaming about what to wear to the next big celebration, don’t forget to check out our Spring Wedding Formal Dresses for even more inspo. Because when it comes to celebrating love, life, and those once-in-a-lifetime moments, you deserve a dress that’s as unforgettable as your entrance.