Finished cozy is 3.25 inches/8.25 cm tall and the body is 8 inches/20cm long without the strap, but it’s easy to add or subtract rows as needed to fit your particular cup.

This pattern was on About.com (which no longer exists) and has been deleted from their site, but for now it can still be found on the Internet Archive. They redirect and delete pages a lot so you may want to download/print to save.