I used to work at a food bank associated with a church, and we would invite folks to services when they were new or if there was a special event (family activity, memorials for servicemen or something)we would hand out flyers. SO MANY PEOPLE would say (and some would mean it) I don't have anything decent to wear to church. And they may not have had anything decent. We would tell them that all we cared about was if they showed up, and if they felt self conscious, we had a clothes bank and they were welcome to use it if they wished.
When they do get to church, they see that the pastor is dressed up(usually) and everyone else ranges from just off the beach towel casual to dressed to the nines. And they all sit together and worship the same God who doesn't even care if they have clothes or not.
Gotta say though, if he DID care, I doubt he would care about knees showing, I doubt if he cares about about 3 piece suits(they used to be the 'norm' at my congregation), but I bet he WOULD be offended by totally ugly clothes in unattractive wash and wear fabrics(because clothes that would require CARE would take away from ones duties to the organization, don't you know!!). I bet he would be offended by NYLONS. And he may think ties are pretty ridiculous also. Worst clothing accessories I have ever seen are WTs though, don't you agree?