This is a polsino (cuff). It was stitched together, but I inserted dark paper and drew one side, then turned it over and drew the other side. (My drawing restores it to how it was before sewn). Now I understand why 18th century people are shown in paintings, (or films and plays) walking with hand elegantly held out. They were admiring or showing off their lace cuffs.
My week-long break in drawing was due to my participation in the Renaissance Society of America annual meeting, held last week in Venice. I gave a conference paper, and I did manage to do a couple of drawings between sessions, such as this one at the Gesuati.