vestyoudaoicibaDictYouDict[vest 词源字典]
vest: [17] Vest was originally used fairly generally for a ‘robe’ or ‘gown’. Its earliest specific application was to a ‘sleeveless jacket worn under an outer coat’. It was Charles II of England who introduced the fashion, and the first reference to vest in this sense is in Samuel Pepy’s diary for 8 October 1666: ‘The King hath yesterday, in Council, declared his resolution for setting a fashion in clothes … It will be a vest, I know not well how; but it is to teach the nobility thrift’.

The direct descendant of this is American English vest for ‘waist-coat’. The British application of the word to an undergarment for the upper part of the body did not emerge until the 19th century. The word came via French veste and Italian veste from Latin vestis ‘clothing, garment’. This went back to the Indo- European base *wes-, which also produced English wear.

The derived Latin verb vestīre originally meant ‘clothe’, and hence ‘induct into an office by dressing in the appropriate garments’. It has given English its verb vest [15], as well as divest [17] and invest. Other English words from the same source include travesty, vestment [13], vestry [14], and vesture [14].
=> divest, invest, travesty, vestry, wear[vest etymology, vest origin, 英语词源]
vest (v.)youdaoicibaDictYouDict
early 15c., "to put in possession of a person," from Old French vestir "to clothe; get dressed," from Medieval Latin vestire "to put into possession, to invest," from Latin vestire "to clothe, dress, adorn," related to vestis "garment, clothing," from PIE *wes- (4) "to clothe" (see wear (v.)). Related: Vested; vesting.
vest (n.)youdaoicibaDictYouDict
1610s, "loose outer garment" (worn by men in Eastern countries or in ancient times), from French veste "a vest, jacket" (17c.), from Italian vesta, veste "robe, gown," from Latin vestis "clothing," from vestire "to clothe" (see vest (v.)). The sleeveless garment worn by men beneath the coat was introduced by Charles II in a bid to rein in men's attire at court, which had grown extravagant and decadent in the French mode.
The King hath yesterday, in Council, declared his resolution of setting a fashion for clothes .... It will be a vest, I know not well how; but it is to teach the nobility thrift. [Pepys, "Diary," Oct. 8, 1666]
Louis XIV of France is said to have mocked the effort by putting his footmen in such vests.