Joseph: Not everyone wears a Gartel. Plenty of hat-and-jacket wearing Yeshiva guys don’t.
How did Jews dress differently between 100 and 50 years ago? Or did we invent the hat and jacket to look different?
DY: Why should that be different than any other case of negative Minhag (e.g. women Schecting)? A shul where *no one* wears a hat probably chose that a lot more deliberately than women “chose” to stop Shechting.