Sentence:  You bully boys of Liverpool, I'll have you to beware, / When you sail on them packet ships, no dungaree jumpers wear; / But have a big <WSD>monkey jacket</WSD> all ready to your hand, / For there blows some cold nor'westers on the Banks of Newfoundland. 
Meaning of the word marked with <WSD> tags:  A type of close-fitting jacket worn by sailors.