I guess it's hard to define, but your defintion would include Matt Walsh and me who would be neither feminists nor GC, so that definition doesn't work.
I've been around FWR for a long time and invoved in many debates and have seen patterns where I would call it an idelogy and where tenets such as gender is a socila construct, gender is oppressive, women are oppessed, the aim is to abolish gender, have been stated so many times you can see the sytem of thinking behind it. Often referrde to as patriarchy, whihc gender is utilsied by to oppress women.
I'd call it an ideology becuase I think those are tenets which are beleifs, that the world is then viewed through and which can't be challenged.
Not everyone is going to agree on that, but these idaeas occur agaian and again in GC discussions to the extent that I've come to see it as an ideology. One which I don't agree with.
I think what you've defined is sex realism. I am a sex realist interested in women's issues, but I'm not a GC feminist.
And I think this example of men in womens clothes is an exmaple of how some gender norms are not merely social contcuts but have some utility based in reality & pretebding it's all 'just clothes' leads to unintened consequences e.g 'wear whatever you like', has led to narcisstic men making women play along.