Press pause and edit your skater. Buy a Hoodie/T-Shirt/Jacket and exit. Enter the store again and select the Custom T-Shirt. Select whatever colour you want the item you just bought to be, edit your receipt and REMOVE the Custom T-Shirt. Do not exit, but return to the store. Just where you could change the colour of the T-Shirt, you can change the colour of your equipped apparel. Exit and you should have your coloured clothes at no extra charge.