long sleeve dress with open back Modal Open-Back Long-Sleeve Mini in Black - M Loosely Fitted Hearts Aflutter Long Sleeve Open

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See more photos inside and the designer of this gown Selena was wearing Rodarte, gorgeous

I also paired the outfit with this crossbody bag from JW PEI and black booties from Poppy Barley

Purple Evening Dresses La Femme 23244 Jersey Gown with Knot Detail and Lace Sleeves La Femme 23023 Evening Gown with Pleated Bodice and Shawl La Femme 22716 Off the Shoulder Evening Dress with Beaded Neckline La Femme 32671 Stretch Satin Prom Dress with Eyelet Detail Neckline La Femme 32382 Textured Chiffon Flowy Strapless Evening Dress La Femme 32955 Fitted Satin Gown with Exposed Boning and Lace Detail Neckline La Femme 32555 Chic Stretch Satin Gown with Corset Top and Flare Skirt La Femme 32946 Net Jersey Prom Dress with Strapless Top and Flattering Ruching La Femme 32995 Mermaid Metallic Prom Dress with Sweetheart Strapless Top La Femme 32897 Mermaid Metallic Jersey Dress with Draped Neckline La Femme 29223 Ultra Soft Jersey Long Dress with Three-Quarter Sleeves La Femme 32791 Mermaid Stretch Mikado Evening Dress with Illusion Back La Femme 32594 Beautiful A-line Tulle Dress with Eyelet Neckline and Lace Top La Femme 32812 Brushed Metallic Jersey Simple Prom Dress with Ruching La Femme 29924 Long Sleeve Jersey Evening Dress with Ruching La Femme 32849 Chic Jersey Dress with Asymmetrical Neckline and Sheer Back La Femme 32887 Beautiful Long Metallic Net Jersey Gown with Flattering Ruching La Femme 33086 Ruched Net Jersey Gown with Square Neckline La Femme 32952 Strapless Satin Evening Dress with Ruching and Lace Up Back La Femme 32579 A-line Tulle Gown with Lace Corset Bodice and Slit La Femme 32649 Strapless Stretch Satin Dress with Sheer Corset Back La Femme 32896 Satin Simple Dress with Sweetheart Neckline and Gathering La Femme 32789 Strapless A-line Tulle Dress with Floral Waist Detail La Femme 32899 Flowy Metallic Net Jersey Prom Dress with Intricate Ruched Bodice

While the black-tie dress code is considered relatively strict after all, it is quite far removed from casual wear it leaves you with plenty of options to look sleek yet original