Star Fleet Academy casual clothes:
T-shirt, sweatpants, baseball cap.
DS9er baseball uniform.
The following images is from an MMO call Sword of the New World or Granado Espada released in 2007, two of their classes only have dress for female. Come on Cryptic, I'm sure you newer game engine can handle longer dresses! Tighter fit dress. Another tight fit one. A larger dress. Another large dress This is the most doable since it is not too long and have enough space for animation.
They barely have clipping issue in that game and the players run around in these all the time.