I think it is a function of culture. Less than 65% of american men own a suit.
If you make wearing a suit a requirement to attend, you automatically lose 35% of men who will not hear the truth of the gospel.
I'm good with that. Last time I checked Jesus and the disciples didn't wear a coat and tie!
Of course, that never worked with my dad...he replied they walked also when I wanted a car!
I cannot think of a church that I attended where wearing a suit was a requirement. We didn’t have ministers issuing decrees on attire, they tended to focus on teaching the Word.