It could be both sides are right – R Falk is a machmir and, among those who say R Falk is a machmir, there are those who dress inappropriately.
There was an incident in NYC a couple of years ago – a redneck attacked a Jewish lady, thinking she was a Muslim. This is now my personal test for tzniut excesses – when you are confused for a Muslim.
I also do not understand black fashion both for men and women. Gemora disapproves red, but not other colors. IT also disapproves black and recommends it only when someone cannot control his yetzer hara and needs to do something inappropriate. It may be that some were wearing black because of poverty, or maybe we are mislead by old-time grayscale photography. Similar, l’havdil, all these Greek statures that are white does not mean they were all wearing white, just the colors wore off.