I would buy yardage. Any time I purchased precuts on line they were always smaller. Cheaper to make my own. I am also a prewasher and put the precuts in lingerie bags when I got them. I measured before and that is when I found out they were off on the measurements. After washing they were off even more. Yardage is the way I'd go. Have fun. I watched Jenny's tute on the pattern. You could do that with just about any template with straight lines. Would be interesting with diamonds.