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 Navy Uniforms: Women's Service Dress Blue, E 1 through E 6. 1984 Uniform Regulations, Page 8 11 PICRYL Public Domain Media Search Engine Public Domain Search Original U.S. WWI US Navy Gunners Mate Service Dress Blue Uniform Set International Military Antiques 9 interesting reasons behind US military uniforms Uniforms of the United States Navy Wikipedia Navy Enlisted Service Dress Blue Jumper Bernard Cap Genuine Military Headwear & Apparel