You've figured it out? Great!
That's not an obvious word in English. I can't think of any other word that would work, except for "pattern," which is confusing because it also refers to the directions you're following. So, "the pattern makes a kind of repeated-triangles pattern...."
Your sweater is looking Beautiful!!!!
Nice blog, I wish I knew more French; un petit pur only, and I have no idea if I'm even spelling that right.