In plural or as a mass noun. Clothes worn, or suitable to be worn, in winter. Often (especially in early use) in poetic and figurative contexts.
Early 17th century; earliest use found in Michael Drayton (1536–1631), poet. From winter + weed.
winter weed/ˈwɪntə ˌwiːd/
Any of various small herbaceous plants which flourish in winter and are regarded as weeds; especially speedwells (genus Veronica) (now rare), and (in the United States) chickweed, Stellaria media.
Late 18th century; earliest use found in William Marshall (bap. 1745, d. 1818), agricultural writer and land agent. From winter + weed.