Navy Blue Off the Shoulder Prom Dress,Evening Dress,Tulle Prom Dress US16W As Picture US NAVY Male Officer Dinner Dress Blue Jacket Used 40 Regular (34 Sleeve) Black (USNA Flying Cross) U.S. Navy Service Dress Uniform at Boston Costume 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