Navy Blue Long Formal Dress with Sheer Sleeves PromGirl Navy Blue Tulle Prom Dresses Mid Length Evening Dress FD3186 Viniodress Uniform: Dinner dress blue, Navy enlisted men, ranks E 1 through E 6 NARA & DVIDS Public Domain Archive Public Domain Search Service Dress Blue (Yankee) uniform was for "warm weather afternoon and early evening functions such as yachting parties." The uniform was formally phased out in 2011 : r navy