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 Elegant A Line Open Back Navy Blue Long Prom Dress, Long Dark Blue For abcprom U.S. Naval Reserve c1923 Cadet's "Evening Dress, Blue" Jacket Navy Blue Pleated Dress Midi Dress Sleeveless Midi Dress Lulus Halter Neck 2 Pieces High Low Backless Navy Blue Prom Dress, Navy Blue abcprom U.S. Navy Blue Dinner Dress Jacket Works Intrepid Museum