Green’s Dictionary of Slang

a dandy, a fop.

1868		Rockhampton Bull. (Qld) 1 Oct. 3/2: It was but a simple and primitive socioety [...] when men caled each other Addlehead, Baldhead, Barebones, Bitch [...] Chisels, Dolt [...] Fogey [...] Gander [...] Maggot, Mangy, Muff, Muzzy.
1909		(ref. to 1815–40) in J. Ware Passing Eng. of the Victorian Era.
1914		Sport (Adelaide) 3 Apr. 5/2: Herbert G looks like a full blown toff [...] Don’t be such a gander, Herbert .