But do you care what YOU wear?
We dress for church to show reverence, not for show, or to bring attention to ourselves. Most of us dress with our "Sunday Best".
"Sunday Best" is different for everyone. It depends on upbringing, culture, affordability and most of all "reverence" to the man who died for us.
If we were to meet the President, meet a celebrity, go on an interview, we certainly wouldn't show up in a t-shirt, tank top, shorts or flip flops. We would dress to impress. God isn't asking us to impress his Son. Just show respect as you would the President or a celebrity.
Food for thought, when you get ready to attend mass on Sunday, ask yourself, how would I dress for the man who gave his life for me?
Jesus is present at the sacrifice of the Mass.