I had to make it thinner than a normal mug cosy, so it would fit between the handle of my boyfriend's one and only mug.
I muddled my way through crocheting the Y but I think it came out ok. Next time, though, I'll make the cosy larger, with a big space for the handle (like this).
The pattern is based off of those from The Cosy Project, which I wrote about in an earlier post here.
I love all of the designs from The Cozy Project. They are so simple but also so cute!