I hope Yunduo is straight. When first introduced she looked like the most cliche lesbian in a powersuit, so I was surprised by her having kids. It would be nice if she dresses like that for herself and not to fit in with a group.
I feel like that's an unfair way to put it. Why would her being a lesbian mean that she dresses to fit in and not because she wants to dress this way? Plus, it's obvious that if she is indeed queer, she's closeted, so why would you she dress to "look like the most cliché lesbian" intentionally?
She's not choosing to dress that way, the author's dressing her that way.
My reasoning was based of the notion that stories tend to rely on tropes and cliches (of which this is definitely a 90's one lol). As far as I'm aware such short hair isn't common in China, even among the roaming gangs of grandmas. They tend to have a couple more inches.
It could be possible that the author just thinks it's cool or there's a deeper character reason. I just think the reason being "she gay" would be boring.
I tend to skip the reasoning and go straight to conclusions when speaking. I'm still skipping a bunch of reasoning for why I feel this way because I'm lazy. Turning feelings into factual statements is difficult.