i'm roman catholic, and honestly, i know that the vatican itself has a rule that you must be covered up everywhere before you go in, but that's the church rules, not the religion's rules. i see people enter our local church in everything from tattered punk-goth getups to short skirts and tank tops with heels, to formal skirt and jacket suits.
honestly, i could care less about what people wear to church. i'm just happy they go. i wear whatever i was wearing that day to church. i don't think about it. if you're too distracted by someone's outfit to pay attention to mass, then maybe you should get off your high horse and stop judging. why else would someone's outfit distract you? i don't think god is judging you if you truly care about mass and are there for him. catholic mass is meant to bring people from all walks of life together as one community. therefore i think it should be fine to dress however you are comfortable when going to church.