It is possible to weave two layers at once with a technique known as doubleweave. You can weave separate layers and exchange them to weave open-sided pockets. You can connect the layers at one selvedge for a doublewidth fabric, or connect both selvedges to form a tube that can be stuffed.
In this class, I'm going to show you how to wind a warp and thread two heddles for doubleweave. We'll learn three doubleweave techniques: weaving layers and exchanging them, weaving layers connected on one side, and weaving a tube. At the end of the class, you'll have a handy tool holder made with all these techniques.