For those who are saying a lot of women already live that way, I should just have rightly said that well yeah, I said that in the OP. 
Anyway, in case anyone ever comes across this thread and is actually wanting to do this stuff or whatever, this has been my experience so far:-
I've been dressing gender free for about a week. Usually if I was wearing stuff that wasn't stretchy/very form fitting and feminine, I would feel uncomfortably fat (I'm not overweight, I'm just weird about weight etc) ugly, and frumpy, but I haven't felt that way.
I think because what I'm doing is supported by an ideology I believe in, I've felt ok/good about it. This is not to say anyone is telling women how they should dress, this is just a thing one school of feeminism tries to do. We think it'd be good if all women do it, but that doesn't mean we're going to criticize other women's choices; every woman's decisions are made in the context of patriarchy.
I'm also trying to stop judging my worth by my appearance as much as I used to. Maye some of you will say you are paragons that hardly ever did this- but this isn't true of a lot of us. So I used to feel bad about my aging face, jawline not perfect etc. I've started to view myself and others in less of an external way. The body is just a vehicle, a minor part of what someone is. Yes, a lot of people maybe always were saints in that respect, but I was not.
Hopefully I can stop having disordered eating patterns as I have at times, as of course that is just another destructive manifestation of femininity to an extent, judging ourselves by our weight, appearance etc. Although more men (mainly gender non-conforrming men) are developing eating disorders, it's still predominantly a female problem. Instead, I'm going to try and eat more healthily.
Prioritizing comfort in clothing is part of self-care, self support.
I also for instance used to have quite a childlike mode of sitting, moving, so I could be sat on the grass cross-legged playing Pokemon, I'd have a dress and leggings on, and a van beeped at me as they thought I was showing my gusset or something. Now I wear trousers I can move how I like and not worry it could be revealing or whatever. I know a lot of women get beeps but it might mean I get less than I previously did (which other women wouldn't have got for ths particular
reason, though many get some of course.)
Trying to do something like this, that goes against gender norms, has made me feel more fiesty.
I like that the clothes cohere with the rest of the ideology of this (possibly fringe) type of feminism. Maybe it's like a religion but I don't mind. I also got a venus symbol necklace. 
Anyway, those are some of my findings.
I would recommend trying it to any woman/feminist who has previously dressed 'girly.'
If you let the male gaze alter the way you dress, then you are letting them win.
@SusannaSpider I wouldn't be dressing any way based on the male gaze particularly, if that's what you mean, it's the opposite. Although maybe if I'm going to come out as lesbian/give up men, a lot of women doing so do choose to dress in a way that doesn't particularly attract male attention.
A lot of women mostly do let the male gaze or what society might see as attractive influence what they wear. To give up all that is the opposite really, it's dropping dressing primarily based on that.
Just because we choose to wear what we want, it doesn't mean we adhere to stereotypes inflicted on us by men.
Clothes such as skirts, dresses etc are stereotypically feminine in themselves.