Guys, What does it mean if a boy tells me to pull my shirt up?

At school today I was whereing a more reveling shirt and in class a boy told me to pull my shirt up, I don't know his reason for it. Could you guys please help, he said it in front of the class but quietly and politely. He usually stares at me but I don't know if he likes me.
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What I meant was pull it up like on the collar part he asked me during class at ASU so I would cover my chest not pull it over my head.

And yes I know what age my profile gives and no that's not my age okay, I'm 20 and I don't know how to fix it.
Guys, What does it mean if a boy tells me to pull my shirt up?
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