Note that this can only be done by server admins with DB access.
- Create new character with desired appearance
Log into game once
Log out
Shutdown server
Open HeidiSQL
Navigate to Character table, Data tab
Find your new character row
Copy the appearance field FROM the NEW character
Apply to the appearance field of the OLD character
Verify that the fields match (it doesn't always paste right)
Post changes to DB
Restart server
Log in with Old Character in New character's body.