Note: This trick only works for shirts, hoodies, and jackets. Pause the game, 
and select "Edit Skater" option. Choose the "Merchandise" selection, and find a 
branded clothing item that you want to have a custom color (for example, a 
shirt). Purchase the item, and leave the store. Wear the item, then go back to 
the store. Select the same category of the item that you purchased, for example 
"Shirts", then select "Custom Shirts". Press Start, go to "Edit Receipt", and 
uncheck the shirt. Select the option to go back to the store. You should be 
wearing the branded item and can now customize it. Change its color as desired, 
then press Start.