SLOP (4)

Slop, n. [[AS. slop a frock or over-garment, fr. sl�pan to slip, to slide; akin to Icel sloppr a thin garment; cf. OHG. slouf a garment. Cf. Slip, v. i.]] 1. 1. Any kind of outer garment made of linen or cotton, as a night dress, or a smock frock. Halliwell.
2. 2. A loose lower garment; loose breeches; chiefly used in the plural. “A pair of slops.” Sir P. Sidney.
There's a French salutation to your French slop. Shak. 3. 3. pl. Ready-made clothes; also, among seamen, clothing, bedding, and other furnishings.