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 File:U.S. Navy evening and dinner dress blue uniforms, c. 1967.jpg Wikimedia Commons Uniform: Dinner dress blue, Navy enlisted men, ranks E 1 through E 6 NARA & DVIDS Public Domain Archive Public Domain Search Official dress uniform is of blue hi res stock photography and images Alamy US NAVY Male Officer Dinner Dress Blue Jacket Used 40 Regular (34 Sleeve) Black (USNA Flying Cross) Navy Uniforms: Men's Dinner Dress Blue Jacket, Officer. 1984 Uniform Regulations, Page 3 4 PICRYL Public Domain Media Search Engine Public Domain Search