How do I look more boyish without looking like a boy

So basically my fashion sense has always tended towards simple, boxier shapes, clean lines, solid colors etc. Uniqlo catalog type shit. Would you believe I'm a lesbian?

The problem is that my body is already pretty boyish: I have no hips, no waist, pretty small boobs. I love the "wearing my boyfriend's clothes" look, but when I wear the clothes I like I just... get called a guy. It's very discouraging! I'm a dancer and that environment is particularly tough, since I'm limited to clothes I can sweat in.

Where are the places in my wardrobe where I can femme it up without femming up the whole vibe? I'm trying to be futch, not a boy!