Many times mittens are edged with a round of fringe around the cuff. In most cases, the fringe is knit in just after the cast on.
To work a looped fringe, cast on the desired number of stitches. Join to knit in the round. Purl 1 round or work 2 or more rounds in k1, p1 ribbing as indicated in the pattern you’re working on.
Turn the knitting so it’s inside out and you can work on the inside (WS) of the mitten.
Rnd 1 (WS): Knit around, wrapping the working yarn around the needle and your index finger 2 or 3 times for each stitch.
Rnd 2 (WS): Knit around, working each stitch together with all its loops as a single stitch. If necessary, give a little tug on the fringes to even them out as you go.
Turn the knitting so you are again working on the outside (RS) of the mitten and then proceed with your cuff.
If you like, you can work another round of fringe, in the same or a different color, after working 1 or 2 rows of plain knitting.