This pattern is available in any size.
I used acrylic yarn to crochet this pattern.
Exact gauge or yardage is not critical, since you make it to measure.
You will also need scissors and a large-eye yarn needle to fasten off, sew the flower to the cozy, and weave in ends if desired.

You will need two skeins of yarn because the cozy is worked with two strands of yarn held together while working. If you only have one, wind off half of it to make two skeins/balls.