Yeah, sure. A sign ought to do it.

I remember a church where the first thing you saw was a sign saying that nobody should enter the building who wasn't properly attired. Shorts were singled out as a particular no-no. I understood (and, in fact agreed with) the sentiment, but I also thought about those mothers of teenagers who go through the weekly battle to get their kids to come to Mass. Do they really need another obstacle in their path?

Yes, people should be quiet in church. And they should be properly attired. They also shouldn't chew gum, or check their phones, or a host of other things. But let's worry more about feeding their spirits while they are there and creating an environment that compels them to return. The other stuff will sort itself out.