英语词源字典 - 在线词源网站

kit (n.1)[kit 词源字典]: late 13c., "round wooden tub," perhaps from Middle Dutch kitte "jug, tankard, wooden container," of unknown origin. Meaning "collection of personal effects," especially for traveling (originally in reference to a soldier), is from 1785; that of "outfit of tools for a workman" is from 1851. Of drum sets, by 1929. Meaning "article to be assembled by the buyer" is from 1930s.[kit etymology, kit origin, 英语词源]
marbles (n.): children's game, from plural of marble (n.); first recorded by that name in 1709 but probably older (it was known in 13c. German as tribekugeln) and originally played with small balls of polished marble or alabaster, later clay; the modern glass ones with the colored swirl date from 1840s.

Meaning "mental faculties, common sense" is from 1927, American English slang, perhaps [OED] from earlier slang marbles "furniture, personal effects, 'the goods' " (1864, Hotten), a corrupt translation of French meubles (plural) "furniture" (see furniture).
trappings (n.): late 14c., "horse-cloth," from Middle English trappe "ornamental cloth for a horse" (c. 1300), later "personal effects" (mid-15c.), alteration of Middle French drap "cloth" (see drape (n.)).