I whipped up a quick knitting pattern this week... a coffee sleeve made from Pakucho organic cotton yarn.
You need a small amount of Pakucho organic cotton yarn (or another worsted weight or aran yarn) and US 8/5mm double pointed needles.
1. CO 36 stitches. Place marker and join for working in the round.
2. Work in 2x2 ribbing (K2, P2, repeat to end) for 20 rows. Your sleeve should measure about 3 inches/7.5 cm.
3. Bind off.
Ok, so that's really simple! And it works great because the 2x2 ribbing is stretchy to adjust to different cup sizes.