I made this after I was requested to make a 'mug jumper'. I couldn't work out how to do that, so I made this instead.
It's nice and stretchy so it can fit over lots of different mugs.
1) CO 52 st in white (long tail cast on). K2 P2 for 3 rows
2) Work design in st-st foor desired length
3) Finish with 3 rows of K2 P2.
4) Cast off
5) use matress stitch to sew top and bottom of the seam, leving a gap large enough for the handle to poke through.