What's the policy to return merch at KI?

I am going to call KI, but since many times when talking to people there are too many Chiefs and not enough Indians when it comes to getting answers, I just thought I would post here to see if anybody's had any past experience?

My receipt says nothing of a return (or exchange) policy, but my girlfriend's shirt she bought at KI is too large (and too small for me! ), and so I wanted to know if I could return it if I had a receipt, and even store credit will be fine! (or KI credit to use at a food stand even!)