Green’s Dictionary of Slang

a smart, fashionable person.

1922		Appleton Post-Crescent (WI) 10 May 13/6–7: Flapper Dictionary ritzy – A Flapper who dresses like a vamp – black dress, jet earrings, black socks.
1952		J. Jones From Here to Eternity (1998) 32: He made enough money [...] to buy his sister a millinery shop downtown where all the ritzies go.