I need to learn how to draw wrinkles and folds on robes

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I need to learn how to draw wrinkles and folds on robes
So...
do first years get classes on how to tie their ties? or are they just expected to know?
I JUST GOT MY RAVENCLAW SCHOOL ROBES
My 16 year old self that found whimscially.com is so happy that my 24 year old self bought it for him!! You all have know Idea how excited and happy this makes me!!!! pictures soon.