You are doing the same by Swishing (as well as getting new items for free) and you are giving another life to clothes which may have ended up in the bin.
Borrowing is a similiar principle and just makes good sense! I often borrow formal dresses and share mine out to friends. Otherwise you can end up buying so many dresses that you only wear once!
Ever since I have started embracing these four options it has really changed things for me. I have more options of what to wear and I make great savings from buying preloved. I really love going into charity shops, they are full of hidden treasures if you're willing to hunt and look through the racks full of clothes, or alternatively at Oxfam online.