Weave a Diagonal Weaving a diagonal shape isn't hard, in this lesson I'll show you how to weave a diagonal horizontally on your little loom. Let's Dig Into Diagonals For your first diagonal, it’s much easier if the two colors you use are the same kind of yarn. If one strand is thicker than the other, you’ll run into problems. Save that sort of creativity for later - after you've had a bit of practice. Here’s a diagram to show you the weave structure....