You pay for a dress's use, and you get it for a duration of time and ship it back when you’re done. Then someone else can rent it and enjoy it all over again.
It's good for the environment because it creates a closed-loop system and powers the sharing economy.
Each service is different but many offer memberships where you can rent items monthly.
Others let you rent from other people, or directly from the service.
Most will provide a garment bag and prepaid shipping label to return your items once you're done.