Contrast Collar Dress Navy & White Della Uniforms According to the 1975 U.S. Navy Uniform Regulations, the rarely seen Service Dress Blue (Yankee) uniform was for "warm weather afternoon and early evening functions such as yachting parties." The uniform was Blue Dress "C" USMC Uniform Guide Left, Dinner Dress Blue Jacket uniform for women CHIEF PETTY Officers. Right, Dinner Dress White Jacket uniform for women officers PICRYL Public Domain Media Search Engine Public Domain Search