Problems with strange shadows appearing on my mesh clothes

Hello, good evening,



I am writing to you in case one of you can help me solve the problem I am having.



I made a mesh of clothes, but when I open it in the cas these strange shadows that you can see in the


are displayed without stopping, does anyone know how to remove these strange shadows?




I have to say that I tried SLYD's tutorial but the error persists...



I share the link here 







for those who wish to help me