By accomplishing talks like finishing a Level, collecting all Coins, the Golden Skull or the Day Charm new costumes for Mos at unlocked. None of the costumes offers any benefits but they might increase the visibility of Mos. Also trying out a costume will grant the Incognito Achievement.
There are different kinds of costumes that can be collected:
- 9 characters
- 13 jackets
- 7 capes
- 19 headgears
- 10 faces
Counting Mos herself and also the no-outfits there are a possible 10 × 14 × 8 × 20 × 11 = 246,400 costume combinations.