If you don't want to wear old clothes, because they are fat or fashionable, you can send them to a clothing store for a little modification. Clothes with good quality can be worn for a long time, and it won't cost much to make a little change.
If you find it troublesome to change clothes, and the style and texture of the clothes are good, you can give them to your relatives and friends. After all, now the wardrobe is updated quickly and the rate of old clothes is high, so close relatives and friends won't mind.
If you don't want to change the style, you don't want to give it away. The style of clothes is also classic and simple, not very fancy. You can have a look. Some charities accept clothes donations.
Many communities have clothes recycling bins for residents to put clothes they don't wear in, and there are special institutions to recycle them and make them into recycled fibers, which is also considered environmental protection. You can also ask at the waste collection station. Some waste collection stations recycle clothes. But only choose high-grade clothes with good styles and sell them by weight.