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I have a dress that looks thin after washing, but it will get bigger, but it will be the same after washing it again. What happened?
Clothes will shrink, but to different degrees. Among them, cotton has shrunk the most.

The fiber is stretched to a certain extent, so that the transfer object is in a stable state. When it meets water, water molecules break this stability and complete the original structure. So it shrinks after washing and stretches into another structure after wearing it.