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 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) File:U.S. Navy FMF corpsman in dinner dress blue jacket uniform, 2016.jpg Wikimedia Commons Elizabeth K GL1506 Prom Dress Navy NewYorkDress MC Dinner Dress Blue Jacket