Duphpherer: Some player setup tourneys allow you to toggle off apparel. Most WGT tourneys don't count apparel or as MB said, just remove it from your avatar.
I don't think there is any option to turn apparel ON in CC tourneys. Same with WGT Tournaments (other than Showdowns and Clash) as I've never seen a regular WGT Tournament/Bracket that has apparel ON.
What the OP was asking was how to set it up so that when he plays Coin Games his Apparel is the same as in WGT Tournaments, which is OFF.