Re: Sail Cover Material
Now that I also see you have a C25, they are to a degree a dime a dozen. I can not remember who off the top of my head, but there was a sailmaker or two with off the shelf sails. I would not be surprised if some off the shelf sail covers are available.....
BUT, with that in mind also.....If you make your own, you can make the cover go all the way to the end of the boom, have snaps in places where the std will be trying to snap thru the boom vang or equal. I know UK Halsey has a measurement guide on there site. Using that along with your current one may get you close to how you really are setup. Also remember, your current sail may be a few/many years old. As they age, the can be more compact to the boom etc. so you may want to add an inch or two to the diam if you ever get a new sail, or one with full battens vs all partials etc.
She drives me boat,
I drives me dinghy!