There are some people who feel that what you wear in church is a non-issue. Throw something on. Show up. Worship and serve. As long as your heart is right, what you wear doesn’t matter.
There are others who feel that what we wear in church should be different than what we wear for other events – or at least from what we wear on our day off. I don’t know anyone who would chide a newcomer or poor person for not wearing a suit or a dress, but there are those who think that regular church attendees should wear their Sunday Best. And ministers especially, should dress well.