shorts! theyre really easy to make.. i think! can u add some tomboy stuff in there? i would totally buy from u! u can have sections: girly girl, tomboy, punk, goth, etc! oh wait im a little of topic. anyway, that probably too much work anyway. u can sell hoodies, jewelry, sweaters, pants, room decor, it really depends on what kind of store. im guessing clothing by what you've mentioned.
Bags, belts, scarves, jewelry, handmade art, handicrafts there is soo much you can do.