Paul, that is the service cover my mother used to make years ago. She is 91 now and can't sew anymore sadly. If you go over to the 914wrold website in the vendors section you will see a vendor IronHillsRestorations makes umbrella covers and took over the service covers after my mother could do them anymore.
Here is a link to his Umbrella Covers
914World.com - The largest online 914 community! his name is Perry Kiehl