Elegant Navy Blue Dresses For Wedding Guests & Windsor A Line Lace Wedding Dress with Plunging Neckline Stella York Sparkling Beaded Glitter Tulle Illusion Neckline Open Back Destination Minimalist Satin Boat Neck Sleeveless A line Wedding Dress VQ Chic Sheath Wedding Dress with a Bold Plunging Neckline. This dark navy wedding guest dress features a square neckline and a delicate lace up back, combining classic structure with modern detailing. The glittering fabric adds subtle sparkle, enhancing its elegant silhouette. Designed for a flattering fit and comfortable wear, this dress is ideal for formal occasions where refined glamour and sophistication are essential.