Unfortunately, there's no way to really present as "nothing", unless I could maybe call on images from dystopian stories where people are numbers and everyone wears beige jumpsuits or something. But like hell am I wearing a beige jumpsuit every day, lol. There's no way to really turn off the "gender noise"; youcan only turn it up, add more, and hope one wavelength cancels out the other.
I have a slightly different presentation sense when I'm alone versus when I'm with my husband (we're LDR so we're not together most of the time). When I'm alone, the best I usually end up striving to "look like" is a soft butch lesbian. Another thing I take into consideration is whether what I'm wearing will get me attention from strangers. I live in a rougher neighborhood, so honking and catcalling are the norm. But I've found that the size of my chest is pretty directly proportional to the amount of attention I get from men, so I dress as boi as possible when I'm going to be going out alone. But when I'm with my husband, I want to confuse people more than disappear. If I can make people think that we're a gay couple, or something else, for even just a split second, I'd call that a success.
As for what I do... well, I've got a quiff, the typical "queer girl" cut these days, I don't wear makeup (unless it's to masculinize my face), I wear men's shirts/tops and sports bras a lot, men's shoes, and men's pants when I can find a pair that are flattering, otherwise I go for baggier women's pants. My face is structurally pretty masculine (I've got a very strong jawline) but the features are very soft, so if I were shorter I could probably pass as a teenage boy. Unfortunately, I'm not just tall, but very long--I look like a cartoon character that's been stretched out--so I'm very firmly in the adult territory. So I just generally shoot for the boi/twink look, and though I miss most of the time, I wind up in "ambiguous" territory somewhat regularly.