U.S. NAVY MALE OFFICER DINNER DRESS BLUE JACKET UNIFORM USN U.S. Navy Line Officer Commander Mess Dinner Dress Blue Uniform size 44 REG #1835362140 Uniform: Dinner dress blue jacket, male Navy officers PICRYL Public Domain Media Search Engine Public Domain Search 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 2 Dinner dress blue jacket uniform, Dress Images: PICRYL Public Domain Media Search Engine Public Domain Search US NAVY Male Officer Dinner Dress Blue Jacket Used 40 Regular (34 Sleeve) Black (USNA Flying Cross)