@Tarage
they might not know what they mean, but kids are clever sometimes, they'd copy em down and ask older people...or just start drawing them everywhere...and then she's in trouble
that "shirt", on the other hand, doesn't actually show anything inappropriate and lacks any odd (read adult/xxx related) symbols that she wouldn't want the kids running around showing/drawing everywhere, and since they are just kids they wont know what activities such a shirt is usually worn before/during, so as long as she keeps everything covered and keeps calm about it, it's JUST an oddly designed shirt to the kids