Shell stitch mug cozy is made for tapered mugs, not ones with straight up and down sides. A couple of really cool things with this pattern: The increases for the taper are worked in the shells, so makes it super easy. Also the shells allow the cozy to reach all the way to the top of your mug, but leaves a cool lip shaped spot for you to put your smoochers. You can drink from the cup without putting your lips on the cozy! How cool is that? Also, the button is attached during the crochet and not sewn on afterwards. You will need a 3/4 shank back button. My mug pictured measurements are 3.75 Inches across the top, 2.5 Inches across the bottom and 4.5 Inches tall.

Pattern is written in American Standard Terms