Blue Dresses J.Crew Factory Line Navy Blue Dress Knee Length Navy Blue Dress Semi Formal Dress Outfits Semi Formal Womens 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 Air Force Unveils New Maternity Uniform Items Royal Blue High Low Prom Dresses Elegant a Line Lace Satin Women Long Party Dress Cocktail Graduation Evening Gowns