I think a lot of people are misunderstanding this. How many times do those of us who "know" to dress up for Mass silently judge those who don't? That those who don't must not be as pious as we are? https://twitter.com/CatholicSat/status/1252482162139545600

The problem isn't that we go in our best clothes. The problem is WHY we go in our best clothes - where is the line between showing honor to God and fitting in with a certain crowd? We don't want people to get the wrong impression? What impressions do we draw about others?

My need to communicate a certain message about my piety through my outfit to my peers is vanity.

The snap judgements I make about someone who violates the dress code is vanity.

Eyes on your own work.

Would you believe I'm someone who thinks it's important to dress well for Mass?

Would you also believe there were times in my life when all I could handle was showing up in sweatpants and a sweatshirt? Would it really be better to not bother?

Thing is, if you're going to say anything at all, you need to do it when the person can actually do something about it.

If they're sitting in church, they probably don't have a sweater in their pocket.

Pro-tip: parishes can create a page on their website for new people ("I'm New") and say stuff about what to expect at Mass, how to register, where the bathrooms are, and the usual dress code. Among other things.