Costume change (Slash Command)
Where # is 0 to 9 which represents costume slots 1 to 10 (costume slots 6-10 are available only through the Paragon Market). You can only change costumes every 30 seconds.
/cc 2 switches you to the costume in slot 3
/cc 9 switches you to the costume in slot 10
/cc 0 switches you to the costume in slot 1
Timing is very important when changing costumes in conjunction with powers or emotes.