I think it's kind of funny how anything that isn't cut to be body-hugging is labeled as guy clothing. Girls aren't allowed to wear loose fitting clothing? There's nothing guy about band t-shirts. Most casual guys' clothes are pretty gender-neutral. Just most girls would rather wear clothes tailored to hug their body and show off their curves.
As long as the shirt fits you; I have no problems with it.
I prefer a girl who is more girly, but if a girl is attractive to me I don't care as much what they wear. I guess I would not have a problem with it. How do you wear a band shirt? Do you wear jeans or shorts with it all the time or do you sometimes be more girlie with it, like these examples? linklinklink