" chronic inflammatory condition of the digestive tract," 1935, for U.S. pathologist Burrill Bernard Crohn, one of the team that wrote the article describing it in 1932.
c. 1400, pecen, "to mend (clothing) by adding pieces," from piece (n.1). Sense of "to join, unite or reunite, put together again" is from late 15c. Related: Pieced; piecing.
Specific meaning "winding-sheet, cloth or sheet for burial," to which the word now is restricted, first attested 1560s. Sense of "strong rope supporting the mast of a ship" (mid-15c.) is from the notion of "clothing" a spar or mast; one without rigging was said to be naked.
1967 in reference to a simple style of clothing popularized in the West and based on dress in Communist China, from French, from name of Mao Tse-tung (1893-1976), Chinese communist leader.