If you bought a garment token, all you need to do is, write down the number of the garment you like and go to market and talk to "Liu-Liu" npc.
Insert the Garment ID, LiuLiu will remove your token and give you the garment you choose.
Note: There are 3 types of garments, you can get them with 1, 2 or 3 tokens. You can browse the garments by changing the level on the dropdown menu at left.
This page will be updated every time it's possible, so please keep checking it.