Green’s Dictionary of Slang

(UK Und.) a well-dressed young woman.

1821		Egan Life in London (1830) 287: On the office being given, the stand-still was instantly removed; and the kidwys and kiddiesses were footing the double-shuffle against each other.
1835		G. Kent Modern Flash Dict. 19: Kiddiess – a slap-up well-dressed girl.
1848		Flash Dict. in Sinks of London Laid Open [as cit. 1835].
c.1850		Duncombe New and Improved Flash Dict.