Im a 16 year old girl and i want to "swag" up my wardrobe...?

Im a 16 year old girl and consider myself a lesbian, though maybe transgender; not sure atm. But i wear dunks and guys' t-shirts and theres this girl i know who's transgender and she has soooo much swag! She wears cool dunks, awesome tight guys' jeans, like those sweater type things with the different colors that look like boxes, and an array of caps. I want to know what type of jeans and other articles of clothing to get that could make me look more "fresh" lol. Like, what type of stores should i shop in? Thanks guysss