A cosmetic is a costume that changes your character's appearance without changing their underlying equipment. Cosmetics do not apply in-game bonuses or change player stats in any way.
To equip a cosmetic, tap your character profile in the bottom left corner of the menu. Once you are on your character’s profile you can alter a cosmetic by selecting the purple 'c' icon on the left side of the screen for the appearance of a piece of equipment you wish to alter. You can also alter the appearance of your mount, accessories, and pets by first selecting the currently equipped version and then clicking on the purple ‘c’ icon found on those item’s screens.
After clicking on the purple ‘c’ icon you will be presented with a list of cosmetics you have already unlocked and can either clear any cosmetics currently equipped or apply one to your character.
When applying cosmetic weapons keep in mind they are weapon type specific i.e., a cosmetic for a spear cannot be applied to a sword.
Cosmetics can be obtained through purchasing cosmetic chests and bundles in the shop. You will also earn a cosmetic version of any item that you receive throughout the game. These cosmetics won’t be removed whether the original item is exchanged or not.
There are also cosmetic items in the game. They will be bordered in light pink and can be found in your inventory. These items work both as a cosmetic and a normal item so they can be equipped as a regular item and a cosmetic. Like cosmetics, cosmetic items do not provide boosts or change player stats in any way.