Green’s Dictionary of Slang

lag of duds n.

[lag n.1 + duds n.1 (1); Harman’s orig. definition is ‘a buck of clothes’, f. SE buck, a washtub, and thus a ‘washtub’s measure of clothes’, buck contemporaneously meant lye, which would be used in the washing process]

[mid-16C–19C] a bundle of clothes for washing.