Guide: Uniform colors/Off duty wear
While these outfits aren't exactly canon, they are quite close to some of those worn by cast members in the various series and films. Here's a few mock-ups I put together using contrasting colors that can be seen in TNG, VOY, DS9 and the TNG Films and a few others that are copies of those seen in the game.
The important thing to remember is really contrast. The ST costume folks liked to use a lot of pastels and put them against darker shades or bright foil trim. Earth tones were usually broken up with bright colors. Cool grays were usually contrasted against dark reds or violets.