Do you think I can tell my grandma to stop buying me clothes?
Why would you tell her that?
I hate when my grandma brings stuff in hopes that I'll wear it.
You shouldn't disrespect your grandmother like that. You should be more grateful for her gifts.
I don't need random clothes that she picks out for me. I'm an adult, I pick out my own clothes.
If you have a problem with the kinds of clothes she brings you you can decline it nicely. There are other options like showing her what styles you really like. It might break her heart to reject her kindness.