So there is one draw back to the wool diaper covers. They don't open from the sides, and so it takes a few extra seconds to completely take off the diaper cover to change the diaper. In the winter time, you can make wool longies - essentially diaper cover pants to eliminate the need to take off pants and a cover (besides they are warm!). No need to buy more material, you can use the leftovers from the sweaters you made covers from - the sleeves!
First, when cutting the cuff off the sleeve for the diaper cover, leave a teensy bit of the cuff behind. Don't cut into the non-cuff part of the sleeve so that the longies won't unravel easily. Cut up as far as possible because you need room for the baby bootie and hemming up on top.
Turn the legs inside out, turn them toward each other and pin a seam all the way from the top to the crotch and back up the back.
When you are done with the seam, turn it right side out and even up the top waistband if needed and make a preliminary hem to see where you ought to put the buttonhole which will serve as the drawstring hole.