Pattern for 3 different christmas stockings.
You should know how to knit in the round and with 2 colors. The pattern includes instructions and hints on how to knit the socks as well as 3 color charts.
23 stitches and 30 rows = 4 inches in stockinette stitch
Gauge is not crucial here, children rather get more excited to have bigger christmas stockings than smaller ones. You can use every dk weight yarn of your choice or thicker. A thinner yarn would probably cause Santa trouble stuffing all the gifts into the stockings.