My daughter bought herself a HUGE mason jar mug. So, a cozy was in order. She picked the colors and I went from there. No pattern. Just crocheted it to fit snuggly.
The orange is 3 rows of single crochet, the white is 1 row of single crochet and the navy blue is 1 row of double crochet. I crocheted an edging of white in single crochet and created the ties from braiding all 3 colors.
To get a good fit, we measured the jar with a tape measure and then I crochet my chain to stretch to about 2 inches shorter than our measurement. It may seam too short, but once you start to crochet your rows, your piece "magically gets bigger" (At least for me it does - don't know why). It worked out good.
I hope you have a wonderful week and find time to create something fabulous.