Mountain climbing is also a sport. You should wear comfortable and slightly loose and breathable clothes, not skirts and shorts. For example, when the weather is neither cold nor hot, it is suitable for climbing mountains. You can wear a sportswear or yoga suit, which is elastic and will not bring pressure to joints and muscles. If you want to lose weight, you can wear sweaty clothes to achieve the purpose of sweating, but you must replenish water in time. There are many people climbing mountains in winter, so you can wear thinner clothes than usual, and windproof clothes are just fine. Of course, personal comfort is most important.