Hyper Light Drifter

There are 10 outfits to collect in the game. Most of them are behind the key doors, so you'll want to collect all of the keys before focusing too much on the outfits, but a few are from challenges and one is part of the story. This guide has all of them in one place. Each of the outfits have different effects, and you can mix and match them. So you can have a sword, cape, and companion from different sets to have three different effects active at once. You can see these effects here.