Go to Customize, then Unlock Clothing. Then enter the following codes.

Effect	Code
Billy from I Get This Call Every Day	NOTURBUDDY
Charlie Murder	PUNKRAWK
Jesse Cox & Josh Mattingly	GREENLIGHT
JSmith OTI	JSMITHOTI
Massive clothing pack	NOTNAKED
Moss from The Yawhg	YAWHG
Qwop Runner	QWOPERATOR
Starseed Pilgrim	STARSEED
The Clown Wanted Everything	CLOWN