There is no actual slimming effect.
If you want to wear it at ordinary times, it is recommended to buy something better, preferably with a brand name, because if this kind of thing is designed unreasonably, the comfort will be much worse and it will not be good for blood circulation.
But don't wear it for too long, no matter how comfortable it is, don't wear it too tightly to be thin, especially when resting and sleeping, so as to relax your body.