This is taken from my new book, “Weaving for Beginners” on page 245. How double weave works and making a sampler follows on pages 246 through257.
Double Weave
Double weave is one of my favorite weaves, and most of my students love it, too.
It seems like magic that you can weave two layers of cloth simultaneously—
but that is what happens.
The cloth will be double thickness with a pattern or design happening when the layers exchange places
—going from top to bottom and vice versa.
I like to be the one to introduce weavers to this technique, because once they understand the concept, they feel so capable and proud.
There is a lot more to learn about double weave than the basics given here.
Read more in weaving books. Some 
special techniques and considerations are given in my third book, Weaving & Drafting Your Own Cloth, beginning on
page 153.
There are three basic variations of double weave:
1. Weaving two separate layers at once: See Figure 481.
2 Weaving a tube: See Figure 482.
3. Weaving double width: (You can weave a cloth twice as wide as your loom!) See Figure 483.