To Duplicate a wear, hold and drag your wear into your toolbar tab. Put it in the bit so where you press F1 you will wear it. Then, drag it to your friend and let go. Now it should show up a thing where you can gift it to your friend. Now, hold F1 as you send it to your friend, and once you have sent it, you should be wearing it! Then get your friend to send it back. Now if that doesn't work, then don't HOLD F1 but press it just before you press send gift.