Using any worsted weight yarn is great for this pattern. Each color choice, button chioice or multicoloured yarn makes these cozies original to their own.
Every time I go through a drive thru coffee house, I am asked for my card for this item. I can’t make enough.
If you can follow a pattern with ease, knit it in the round and cable knit, you’ll be awesome at this beautiful pattern.
I recommend using the suggested materials because if you don’t it will not fit the cups. Make sure when you’re casting off to use a stretchy cast off otherwise, the bottom will be too tight. The pattern suggests a k2tog, switch new loop to working needle and knit it together with next stitch. Fairly easy, if you have troubles, I learned it from searching “stretchy cast off” on YouTube.