How do i get my mom to respect my clothing choices?

Let me preface thus with the fact that my mother is great. I love her and she does do her best.

Anyway, I normally like to wear t-shirts with leggings or shorts and dresses sometimes. I normally only wear knee-length dresses with the shoulders covered. Now today, me and my mom were going shopping at the mall, so i picked out this long-sleeved loose shirt i liked which was green with leaves on it. When i tried it on, my mom was like “are you sure you like that? I mean if you really, really want it i guess we can get it.” I ended up taking it and she then paused before the register and kept asking and asking until i eventually put it back. Later when we were leaving, she was like “look, i get that you liked it but you are a teenager and you really should just save those clothes for when your older. Your young, you have a nice body, why dont you pick something else?” I then asked to go hime and she was like “lets sit on this for a few minutes” so we sat down and she pointed out the people walking by and how only adults wore long sleeves. Eventually we went home but later she called me upstairs and was like “i have such a cute top for you” and showed me a off the shoulders blue crop top she has and made me wear it. I told her i didnt like it and stated that i didnt like it when my shoulders were exposed and that i hate crop tops. She then was like “but its so cute. Now try it with this skirt and show your dad”. So we did that and then i came back and said again that i didnt like it and she was like “seriously, its so cute on you, why wont you wear it? Im gonna buy it for your birthday” so im like “i will never wear that. Save your money.”

I just dont know what to do. She keeps telling me to dress like other teens and that she has such great fashion sense but i just dont want to wear crop tops or anything.