Yes, wearing a black tie to this kind of occasion is appropriate and expected
COMDTINST M16790.1g(series), chapter 10 section C When to Wear Uniforms On board operational facilities, under orders - working or undress uniform When conducting VSCs - working or undress uniform When an instructor or aide in PE classes - undress blue, tropical blue, winter dress blue or service dress blue When conducting a Marine Dealer visit - service dress blue or tropical blue When to Wear Uniforms(continued) Hot weather uniform when doing patrols, VSCs and ATON missions - when warranted DIRAUX or Auxiliary elected officer or person in charge of mission (i.e., Coxswain), may require specific uniforms for specific missions ALL members on missions must be in identical uniforms When Wearing the Uniform is Prohibited In public places of dubious reputation When engaged in political activities When in a foreign country Dont wear civilian outer wear (coat, sweater, jacket, etc.) with the uniform Home-made uniforms are prohibited
Waist Detail: Adjustable or cinched waist for a flattering shape
The proof
It has a v neck, a drawstring waist that you can cinch for a tighter fit and a full skirt
Its been so nice to get away from the daily grind and relax with family
