Gloak

You're a prime gloak, an out-and-outer, to get as far as you did before they grabbed you.

‘Brit, by the look of him,’ cries a short, freckl’d seaman in whom Stature and Pugnacity enjoy an inverse relation. ‘– long way from home ain’t you old Gloak?’

[…] both toby-gills [highwaymen], buz-gloaks [pickpockets], cracksmen [housebreakers], &c., but from their good address and respectable appearance nobody would suspect their real vocation.