kit (n.1) Look up kit at Dictionary.com
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 (n.2) Look up kit at Dictionary.com
"small fiddle used by dancing teachers," 1510s, probably a shortening of Old English cythere, from Latin cithara, from Greek kithara (see guitar).