No one could help when I posted an article on this site looking for help in making a skirt for an old (pre-1970) O'Day 23, although I appreciate the two postings from folks who tried to help. (This is the model with the whole cabin raised by pop-top camper gear and the mast stepped on the sole.) Meanwhile, I designed and fit and tried and finally sewed up a skirt that works and looks pretty good, if you don't look too close - my sewing is amateurish. Used an old E-Scow sail for fabric, various E-scow sail windows for ports, and a slew of Dot fasteners to match the ones that were still on the boat. Pix available for owners of old O'Day 23s with need for skirt.