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 Navy Blue Maxi Velvet Formal Prom Evening Dress TS2601 Size 4 Navy Elizabeth K GL1506 Prom Dress Navy NewYorkDress Uniform: Dinner dress blue jacket, male Navy officers PICRYL Public Domain Media Search Engine Public Domain Search Marlow White Navy Blue Military Uniform for Men (Size 39S) US Navy Dinner Dress Blue Jacket of Frederick Becton Patriots Point Naval & Maritime Museum