My Character cloth transparant when i import fbx into unity

So i have a character that i made it by Blender then i export the character to .fbx, when i put the character into unity, my player cloth got transparent. Please help me, how to fix this?
i don’t know how to explain this, please take a look the video.

Here video showing the issue

Got it, “The Shaders work on once side” so i just need to give some thickness to my chara cloth.