Here’s what consumers have asked with answers from 1015Store staff and previous consumers.
Don't purchase from them. It's not possible to return items -- their return address is non existent and my package was returned by the post office. Quality is extremely cheap, too.
The address should be on your invoice. It's usually on the first (or last) page, I can't remember. Any way, here is the return address: WJ Apparel Group 721 Agatha Street Los Angeles, CA 90021 U.S.A. Just make sure to include your original invoice and check off what you're returning and why. I've returned a bunch of things there and had no issues.
Are you asking how to return? It's simple: you just fill out the invoice. There's a spot to select "return" and then you fill out the reason why and send your items with the sheet to the address on the invoice. They do NOT do exchanges. You will need to return the item then re-buy it in whatever size you need.