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knickers (n.)[knickers 词源字典]: "short, loose-fitting undergarment," now usually for women but not originally so, 1866, shortening of knickerbockers (1859), said to be so called for their resemblance to the trousers of old-time Dutchmen in Cruikshank's illustrations for Washington Irving's "History of New York" (see knickerbocker).[knickers etymology, knickers origin, 英语词源]
sloppy (adj.): 1727, "muddy," from slop (n.1) + -y (2). Meaning "loose, ill-fitting, slovenly" is first recorded 1825, influenced by slop (n.2). Related: Sloppily; sloppiness. Sloppy Joe was originally "loose-fitting sweater worn by girls" (1942); as a name for a kind of spiced hamburger, it is attested from 1961.
blouson: "A short loose-fitting jacket, typically bloused and finishing at the waist", Early 20th century: from French, diminutive of blouse.
onesie: "A loose-fitting one-piece leisure garment covering the torso and legs", 1980s: from Onesies, a proprietary name for a garment of this type, based on one + -sy.