Today I went to church in a t-shirt and shorts. Ooo.
Some people think going to church is a formal occasion, and at some churches it probably is. Some say you need to dress up to show God the respect He deserves.
You know, those are great reasons to dress up. But I managed to show proper respect to my earthly father wearing t-shirts and shorts. I think I can show respect to God with them, too. It doesn't really matter what you're wearing. Honestly, I just want to be comfortable when I'm hanging out with the Father. I'm going to sing, I'm going to listen to a sermon, and I'm going to hang out with my siblings after. If I felt stuffy, I would be worried about that instead of worrying about what really bears worrying.
So I say, wear what you want to church, if your church allows it. But if I were you, I wouldn't wear that "Jesus is f'ing metal" t-shirt.