What designs on apperal that can get you in trouble in school?

[Guest I_play_with_dolls]

guns, phrases, ect.

So I want to purchase a band t-shirt that happens to say sex and violince on it, but I'm scared that I may get in trouble because it may not be considerd 'school appropriate' with some of the teachers, I mean some of the teachers even threaten us with detentions for saying the phrase "___sucks" because it isn't considered 'nice'.

Also, like last year, my friend was force to wear his shirt inside out because the shirt happend to have a gun on it

One time I was even threatend to get suspension by a teacher because my necklace that happend to have a knife and a gun on it, I mean really, it's not like I have the ACTUAL thing with me.

Anyways, what designs on clothing and jewlery can get you in trouble with your school? I mean designs besides porn and gang signs.