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 U.S. Navy Blue Dinner Dress Jacket Works Intrepid Museum Find of the Month: Early Edwardian Dinner Dress The Pragmatic Costumer Sky Blue Corset Cutout Long Formal Dress with Slit, Sky Blue Custom Size