Sentence:  ... he was presently undrest, all to his shirt, the fore-<WSD>lappet</WSD> of which, as he lean'd languishingly on me, he smilingly pointed to me, to observe, as it bellied out, or rose, and fell, according to the unruly starts of the motion behind it: 
Meaning of the word marked with <WSD> tags:  A small decorative fold or flap, especially of lace or muslin, in a garment or headdress.