Sentence:  On 1 February 1505, he ordered a new set of clothes for prince: an arming doublet of black satin, with fashionable detachable sleeves, and with it an arming <WSD>partlet</WSD> or under-collar ... 
Meaning of the word marked with <WSD> tags:  A covering for the neck and upper chest, originally worn by both sexes, but later especially by women to cover a low neckline. (from 16th c.)