Well, I'll just give an example. My husband does not have a suit. Actually, he has one but it does not fit him anymore. We cannot afford one right now. He will not go to church without a shirt though, for that's what he wears to work everyday. He'll not wear a T-shirt or shorts to Mass, but since he only has two formal pants, if they're wet or dirty, he'll have to wear his pair of jeans. (Yes, my husband only has 3 pants!)
So, my point is, he tries his best and gives his best to God on Sunday Mass. But we've learned from experience that we should not judge what other people wear to Mass. Of course, we do not agree with immodest clothing. But in our NO parish, we have some 40% of very very poor parishioners (how do call their houses? Slums, right? In Portuguese, they are called "favelas") One has to see where they live to believe. South American poverty is very hard and also very different from European or American poverty). So, in our parish, we'll see a few people in suits, mostly doctors and business men and most people in regular everyday clothes. And only myself wearing long skirts or dresses. But that's a whole other story .... 
