Can guys tell if a girl isn't wearing a bra?

ChelsiChu
I've never really felt a need to really wear a bra in public unless I'm working out or something (unfortunately there's not much to cover). Can guys usually tell whether or not I'm wearing one, say, through a t-shirt? (For context, I'm 22A)
Updates
+1 y
Sorry for the typo... Thanks anonymous in the comments for pointing it out. I'm 32A, not 22A... That would be ridiculous.
Can guys tell if a girl isn't wearing a bra?
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