Player has access to items that do nothing but change the characters appearance and possibly sounds, having absolutely no impact in actual gameplay. Usually these have separate slots from normal gear.
Name variations: Transmog, Glamor, Infusion, Infuse
The first video game about Vanity items was released on October 2003.
This can be clothing, dyes, wigs, hats, alternate textures/models/animations/sounds, and so forth.