The christmas stockings are all knitted in dk-weight yarn. They come in one size.
Gauge is not crucial here, children rather get more excited to have bigger christmas stockings. You can use every sport weight yarn of your choice or thicker. A thinner yarn would probably cause Santa trouble stuffing all the gifts into the stockings.
To succeed with the christmas stockings knitting patterns you should know how to knit in the round and knit in two colors (fair isle techniques come in handy). The patterns include detailed descriptions to knit the stockings and color charts.
The heel used for the christmas stockings is a half short row heel. This feature makes them easy to lay flat and hang nicely. You can knit any heel of your preference of course, but this method of heel knitting produces great results for christmas stockings as they are not supposed to be worn. Normal sock heels create a bulky area when you hang and fill them – the half heel does not!