Reimport the mesh after edit in blender. I did not touched shirt’s mesh at all. What should i do?
In blender use “shade smooth”, it looks like it’s using “shade flat” (I have it in the right click menu but I’ve changed too many controls in Blender so I don’t know if it’s there by default)
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Thank you so much Ares9323. It works!!! 
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I’m glad that it works! Please mark my previous post as answer!