I think the main purpose is to control fever, which is equivalent to putting a tight plastic wrap on your body, which is more conducive to your sweating. In fact, in the process of sweating, your weight is also falling. In the past, people who lifted weights would wear fitness clothes because it would require you to lose weight in a short time, but athletes have a large proportion of muscles and are not so easy to lose weight. Body-building clothes greatly reduce weight by sweating in vitro.
But most of your weight loss comes from the evaporation of sweat, and the effect of weight loss is not so obvious. Moreover, fitness clothes are generally tight. We all know that the coach will make you wear some tight clothes during exercise, but they are relatively soft. But I think fitness clothes are a little hard, so I don't think fitness clothes are a good way to lose weight, but if they play a role in losing weight quickly, they will definitely be second to none.
I recommend a way to lose weight, that is, don't eat after noon. In fact, not eating after noon is not a clear meaning, that is, you should stop eating after two or three in the afternoon. Then I estimate that after a month, your weight will also drop by six or seven pounds. In fact, fat people tend to get fat because the intake is greater than the expenditure, resulting in energy accumulation, which is manifested as obesity. As long as you keep your mouth shut and spread your legs and follow this principle, I think you can lose weight successfully without fitness clothes.