Uniform: Tropical dinner dress blue, male Navy officers. Country: Unknown Stock Photo Alamy A Line Tulle Gold Blue Long Prom Dress Blue Formal Evening Dress 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 Elegant Off Shoulder Navy Blue Evening Dress with Cape SS206 Navy Blue 14