If it will always be in a garage, there is no need for a waterproof cover, which might not breathe.
Get any non-air-moisture-tight interior/garage dust-cover.
California Car Covers are excellent - they have different "grades" (around $300 for interior-storage/flannel cover).
Dustop Soft As Flannel Indoor Custom Car Cover - 10% Off Until 8-31-18 - $298 less 10%, free shipping.
