The bigger challenge is keeping the thing on at speed. I have lost many over the years. I now use a small leash. Clips on the back of the cap and the other end clips on your shirt or jacket collar.
Cheers,
My brother just bought his first sports car, sadly not a Morgan but I did try, I have just bought him one of these cap savers as mine has saved mine a few times. £4.95 on eBay under sailing accessories.