I’ve never seen reason to object to what anyone was wearing in church, I don’t think … but I’m pretty open and accepting. (Although, the dog collars kids wear these days bother me, for some reason.)
I usually wear a t-shirt and shorts (or jeans) to church, and I don’t think anybody’s ever objected … I’ve always felt (like the previous two posters, that God doesn’t really care what’s on my body, as long as my heart/soul is pure. I hope that’s what He thinks… =))
When I was in Italy, I know everyone was required to have their knees and shoulders covered in order to enter a (Catholic) church, and women were also asked to have their heads covered. Some places still keep the old ways…