Green’s Dictionary of Slang

toffer n.

[toff n. (2)]

a well-dressed prostitute, catering for rich clients.

[UK]Hotten Dict. of Modern Sl. etc. (2nd edn).
[UK]Sl. Dict.
[UK]Farmer & Henley Sl. and Its Analogues.
[Aus]Crowe Aus. Sl. Dict. 86: Toffer, a gay, well dressed woman.