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 File:U.S. Navy evening and dinner dress blue uniforms, c. 1967.jpg Wikimedia Commons WW2 German, Soviet, Allied militaria, uniforms, awards, weapons history. War relics forum US NAVY Male Officer Dinner Dress Blue Jacket Used 40 Regular (34 Sleeve) Black (USNA Flying Cross) Uniform: Dinner dress blue jacket, male Navy officers PICRYL Public Domain Media Search Engine Public Domain Search U.S. NAVY MALE OFFICER DINNER DRESS BLUE JACKET UNIFORM