Simple Royal Blue Long Sleeves Prom Dress,Royal Blue Evening Dress Y50 Simplepromdress According to the 1975 U.S. Navy Uniform Regulations, the rarely seen Service Dress Blue (Yankee) uniform was for "warm weather afternoon and early evening functions such as yachting parties." The uniform was Blaise Navy Satin Prom Dress US 0 Beginning Boutique Exclusive Royal Blue Formal Dresses Macy's Royal Blue Velvet One Shoulder Long Formal Dress with Attached Train Royal Blue 00 Velvet