Well, it’s a sign of respect to dress nicely when visiting anyone

Have some respect and show up looking presentable to worship the lord. Its that simple.

YES! you can wear what you want in a Catholic church & if you get kicked out try again in a proper city. No dress code. These people make catholics look bad.

Is not life more than food, and the body more than clothes? ..... And why do you worry about clothes? See how the flowers of the field grow. They do not labor or spin. Yet I tell you that not even Solomon in all his splendor was dressed like one of these. If that is how God clothes the grass of the field, which is here today and tomorrow is thrown into the fire, will he not much more clothe you-you of little faith? So do not worry, saying, ‘What shall we eat?’ or ‘What shall we drink?’ or ‘What shall we wear?’ For the pagans run after all these things, and your heavenly Father knows that you need them. But seek first his kingdom and his righteousness, and all these things will be given to you as well.

In a Novus Ordo Parish you can wear what you want for most part and nobody will bat an eye. But in a Traditional Latin Mass Parish it is a Different Story. At the same time I don't believe that anyone would ask you to leave even though it would be Unacceptable.

Yes you should be well dressed when you go to church but no Christian should stop you from worshiping. If it is something done repeatedly out of disrespect then can be case but no one should get in your way of meeting God.

You should be dressing how Jesus will receive you, not people. Christ says "come as you are" as He meets you where you're at. But, as a recovering catholic, you won't catch me in that church of Babylon. Period.