What is the coolest fabric to wear in summer? In fact, I suggest or wear cotton clothes, washing machine after dry or wrung dry, must be stretched smooth, dry will not wrinkle. Cotton is also divided into a variety of, you can choose a more smooth point, but I do not know the specific. Polyester has its advantages, but it's airtight and smells bad. Silk is comfortable and breathable. But there are a few problems. 1. Good silk isn't cheap, and cheaper Chiffon is made of polyester. 2, Silk Clothes really bad maintenance, can not machine wash, it is best to use silk special detergent. You can't shake it, you can't squeeze it.