When a girl pulls the hem of her shirt and skirt down in front of a guy? What does that mean?

Anonymous
I'd always heard that when girls pull the hem of her shirt and and the bottom of her skirt down in front of a guy, she's trying to "cover up" 'cause she's repelled by the guy and it's a subconscious way of creating a barrier between him and her lady parts.

And we see that in movies all the time: the socially clueless, overly sexual douche... and the girl will start tugging at the hem of her skirt as soon as he leans toward her.

I noticed a girl doing that around me a lot, so I assumed I was making her uncomfortable and maybe she thought I was creepy or something. I thought she was saying "back off" so I started ignoring her, but after that she kept staring and initiating conversation. So what gives?
When a girl pulls the hem of her shirt and skirt down in front of a guy? What does that mean?
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