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 One Shoulder Prom Dresses With Slit, MP941 Musebridals Elegant Light Blue Satin Arabic Evening Dress With Overskirt SF048 Light Blue 16 U.S. Navy Blue Dinner Dress Jacket Works Intrepid Museum U.S. COAST GUARD MALE DINNER DRESS BLUE JACKET UNIFORM