If the clothes are too small, they will be tight and uncomfortable. If the clothes are too big, they will look baggy and affect the effect. Therefore, it is very important to choose the appropriate size. Generally speaking, if the clothes are too tight, you should buy a bigger one; If the clothes are too big, you should buy smaller ones.
In addition, if the purchased COS clothing really doesn't fit, you can consider the tailor's shop to modify it. It is a problem to judge whether to tighten or relax according to the actual situation.