SJS, I didn’t have time to read through this whole thread so I might be repeating other ppl.
As far as I know it all depends on the “minhag hamakom.” Obviously, if someone would wear jeans in boro park they would be making a statement, even if unintentional. However, I’ve been in many out-of-town communities where the men wore jeans and they were all frum ehrlich ppl.