I just got my custom car cover by California Car Covers and I LOVE it!!! It fits nice and snug and looks to be breathable. Bonus - it's made in the United States!
I hate to mention this, but putting a "condom" on your car will not likely prevent it from bringing more Ts into your life. . .
I've had this cover for years on my '31 Chevrolet Coupe for years. It's great, and yes, it seems to breathe.
I remember, or care, what I paid because I know I've gotten my money's worth, big time.
I have a California Car Cover on my 1971 Plymouth GTX. I would have one on my T as well, but it came to me with a different, no-name cover that nevertheless fits and works well.
Car covers are great, even in the garage. They help reduced the dust accumulation and help prevent casual scratches from accumulating.
David, now that's funny!