Green’s Dictionary of Slang

chain and locket n.

a pocket.

1922		W. McG. Eager Contemp. Rev. n.p.: Vey dropped ’im one, wen’ fro ’is chain an’ lockets, ’alf-inched ’is splosh and lef’ ’im barmy.
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.