Green’s Dictionary of Slang

shift-monger n.

[SE shift, a large, highly starched shirt-front, sported as part of such a person’s evening dress + sfx -monger]

a young man-about-town.

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[UK]Bird o’ Freedom 7th Mar. in Ware (1909) 221/2: The shiftmonger rolled into the Roman’s (Romano’s – an Italian restaurant in the Strand) blind, speechless, paralytic. Staggering up to the well-known slate, he wrote thereon, in trembling characters, ‘Coffee and soda for one. Wake me in time to brass for Baiet Gurlesque’.