Green’s Dictionary of Slang

1. a collar that meets at the front, a style fashionable during the mid-19C.

1857		Trollope Three Clerks (1869) 252: He had bestowed perhaps the greatest amount of personal attention on his collar [...] Some people may think that an all-rounder is an all-rounder, and that if one is careful to get an all-rounder one has done all that is necessary. But so thought not Macassar Jones.
1859		G.A. Sala Twice Round the Clock 83: For them the geniuses of ‘all-round collars’ invent every week fresh yokes of starched linen.
1860		Hotten Dict. of Modern Sl. etc. (2nd edn).
1865		P.E. Strangford Selection II 163: Dressed in full uniform, with high stand-up collar; the modern all rounder not having got so far into Asia [F&H].
1870		Hotten Sl. Dict.
1895		C. Crowe Aus. Sl. Dict 3: All Rounder, `masher collar,' one meeting in front.

2. (US Und.) a clergyman, who wears a ‘Roman collar’.

1935

A.J. Pollock Und. Speaks.