I remember what my best friend said to me the first time I attended church with her. My whole family had only ever done church with the whole "Sunday best" view, and I hadn't ever been (well once as an infant), I didn't own "Sunday best", and my mother couldn't figure out what to put me in (I had to be about 12 or 13 at the time). So I asked my best friend to help me and she said "Just wear whatever, just make sure it's clean, what you wear to school would be fine", and I brought up the "Sunday best" to which she said "Look, God made you naked right? You really think He cares what outfit you wear? No, he doesn't. So no one else should either", that's still her stance. She wears jeans and flip flops to church without a second thought. After all, God doesn't care, why should you?
The church Partner and I occasionally attend has the "just wear clothes" policy. One day there was a young guy (late teens/early 20s) with a blue mohawk and decked in the traditional punk attire. And this older lady approaches him, dressed in a long skirt and button down blouse, she taps him on the shoulder and asks if he's here alone, when he says he is she says "Well, my husband is ill and couldn't make it today, would you mind sitting with me and keeping me company during the service today?" he smiled extended his arm and said "It'd be my greatest pleasure" and walked her to her seat and sat right next to her. Every time we've been since, he's sat right next to her. He's brought friends of his along and they sit on his other side. It's the coolest thing to see.