First thing I’d say is if we’re looking in the Old Testament for instruction on how to dress for worship, consistency demands that we do the same thing with food, annual treks to Jerusalem, etc. Though the Old Testament might teach us some things, authority for church practices is found in the New Testament (Ephesians 2:14-15, Colossians 2:13-14).
With that said, there’s no mandate in the New Testament that Christians should dress in certain clothing for worship. In fact, there’s only passages which directly speaks about it is James 2:1-13. With that said, we can certainly show God that we lack respect for Him in a variety of ways - including not giving our attire ANY consideration (could say a lot on this).
The teaching I heard most growing up was “Jesus gave His “best” for us… so we should dress in our “best” for worship. In my opinion, that’s horrible hermeneutics because for one, Jesus didn’t give His “best” - He gave His all. Second, it’s impossible to make that leap when the New Testament is so silent on the matter. If God wanted us to dress in specific clothing for worship, He would have made it plain to us in language very similar to Exodus 28:4.
