If your best clothes are thongs, cargo shorts, and a wifebeater tshirt, you're probably too poor to even have a pot to pee in. In that case, God bless you. But one can get some fairly decent clothes at a second-hand store.
I wear a simple shirt, tie, slacks, and dress shoes for church every Sunday (even in the summer when it gets around 110 degrees, like today). The rest of the year I may wear a suit coat. It really isn't that hard to do for one hour a week.
I was going to make a “Sunday Best” reply, amazing it took so long to happen.
I live in a weekend recreational area where people come up to their cottages, they show up in church in shorts and T shirts. But at least they show up.
IMHO the Catholic Church is dying, through their own fault. Used to be the church encouraged families and often had 3-4 generations attending. Now it is 90% old people. And when they die off the church will close.
At my Parish, that poor sod need only have a chat with one of the Deacons, and he will get lots of help with his material problems generally.