What do I do with the item I’m exchanging? Just include that piece in your prepaid return envelope with any other items from your box that you’re not keeping. Related articles Do I need to pay for shipping on a size exchange? Can I return an item that I’ve purchased through a size exchange? When can I expect to receive my size exchange? I love something in my box but it doesn’t fit. How do I request an exchange? What is Dia&Co?