You sure can! All you need to do is return the item that doesn't fit and place a new order in the correct size. To get the same discount on the new size, just contact us after you have received the item, and we will adjust the price afterwards. Depending on the payment method you chose, we will either refund the difference or adjust the invoice.
The item is sold out in my size
If your size is sold out, you can create a size monitor so you get an email as soon as the item is back in stock! Read more about size monitors here.
Get back to us when you have managed to get hold of the item, we can still offer you the same discount.