Green’s Dictionary of Slang

(Aus.) a Cockney woman.

1919		W.H. Downing Digger Dialects 23: fevvers (n.) — A Cockney woman. (‘Where’d jer get the fevvers, Liza?’).
1924		(con. WWI) A.G. Pretty Gloss. of Sl. [...] in the A.I.F. 1921–1924 (rev. t/s) n.p.: fewers. A Cockney woman.