How do I get my mother to stop buying me ugly clothes?

For my entire life, my mother has been in the habit of buying me clothes. I’m not talking about taking me to a store and letting me pick out a few things, I mean like she’ll find a shirt at one of her stores, buy it, and then ask me if I’d like it. Unfortunately, she has a tendency to pick things that I don’t like. And by tendency, I mean that out of several hundred things she has gotten for me, 90% have been gawd-awful, and the rest have been of the “Well, if I have nothing else to wear, I guess I could put it on” variety. Not once has she gotten me something that is actually my style. Ever. She took me dress shopping last year – of the 100+ dresses she showed me in the store, not one of them was even “try on” material.
I thought that once I was older and not a minor, she’d stop. She hasn’t.

Here’s the really hard part: Every time I tell her that it’s not for me, she looks so hurt and dejected and says in a little kid voice “Oh, ok…”. It’s like I’ve shot Bambi’s mother.

What I’d really like is for her to simply stop buying me clothes so that I don’t have to shoot Bambi’s mother. How do I accomplish this?