Mimic Blood is a cosmetic item in game. It can be bought for $5 at the Arts & Crafts & Shirts & Hats Store beside the Bogomart before entering St. Sander's Cemetery, and at the STUFF store in the location Gor'Castle Gift Shop. Using Mimic Blood is not required, but one method to getting the I Like it Better This Way achievement.
Mimic Blood allows the player to swap the stats of the article of clothing they currently have equipped to another piece of clothing that they desire. This is very convenient for players who wish to keep looking stylish as they progress through the game.