Simple blue satin long prom dress, blue long evening dress fg4854 formalgowns One Shoulder Royal Blue Long Prom Dress Simple Evening Dress PG846 Custom Size Royal Blue 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 U.S. Navy Blue Dinner Dress Jacket Works Intrepid Museum