What color should I buy underwear?

First of all, 100% cotton is the best choice for underwear. Modal is more comfortable to wear, but I think nothing else is good. The color is mainly light, and the dark color is definitely dyed. Wearing it for a long time will affect health. Generally, bleaching is not required. This is the first time I have heard of it. If you are worried about buying a flesh-colored one, you don't have to worry about showing traces when you wear it in summer.