G'day all!!!
Without trying to sound like a know it all

; and in no particular order here:
Bunny Yeager was in fact dark haired and blonde by the bottle, early on in her professional years (
Dead Link Removed) (
http://www.bunnyyeager.net) but to the best of my research she did not venture to NYC to photograph or for that matter she did not venture much out of Florida in the 50's.
Meier was in fact born in France and came to the US, with NYC being her first port of call. Many of her photos are unmistakably in Gotham. She did settle in Chicago to become a nanny to at least 2 families and did venture back to NYC on at least one occasion. But I do have reservations about her lack of fashion sense, as I believed that she had tried not to be noticed when shooting on the street. She also seems to have used the TLR from about waist level (at least from looking at some of her work - self portraits and others) while the Brassai image has the woman using the magnifier in the viewfinder right up to her face.
Oh and @ Regular Rod are you referring to the photo in front of the NYC Public Library of the fashionable woman on the steps as shot thru the bus window? The subject here could certainly be the mystery woman but I doubt that Meier had photographed herself thru the bus window.
And @ Clive H. I couldn't find any reference to Jane Brown visiting NYC or using a TLR? Do you have any references?
All kidding aside I do thank one and all for the various thoughts and observations about thermonuclear weapons that people those days wore on their heads...............!! Thank goodness those days are over.
More wood for the fire.
Cheers!
Sam