First I want to refer this great suggestion thread of Japanese clothing and hairstyle. I’d really love to see that on Episode. However, @decembermaria20 talked more about Japanese features, so I’d like to focus on China, and a little bit on Korea.
Qipao - traditional Chinese clothing for women. Can be in different colors and styles
Changshan - male Chinese dresses.
Tangzhuang - traditional jacket for women and men. Now mostly older generation wears it.
Also lighter version of Tangzhuang is used as Tai Chi outfit.
Hanbok - traditional Korean attire.
Oh, and of course - masks! A huge part of fashion and culture in modern China, Korea, and Japan.