navy dress blue uniform regulations Uniforms: Men's Service Blue, Officer. 1984… — PICRYL Female Officer Full Dress Blue
Description
See where you can take off some useless trimming here and drape the skirt more becomingly there

Core elements include white woollen trousers (portki) that narrow at the bottom with distinctive side slits for cold weather fastening
Women should wear a formal floor-length gown that does not reveal the ankles at the hem of the dress, but if the wedding seems a bit less formal, a sophisticated cocktail dress may also be acceptable
It features a sleeveless ruched sweetheart neckline followed by ruched side panels down the sides, adjustable spaghetti straps for a customized fit, and a floor-length asymmetric mermaid silhouette with a tiered ruffled chiffon hem

Thankfully we already have a skirt and white collared shirt she can wear