Pattern is made with granny squares and is lined. I’ve included instructions to make a no sew lining using Liquid Stitch but it can be sewn if you prefer. The strap won’t become stretched out because we use a stitch called thermal stitch that has some stretch but bounces back well. I’ve included instructions for thermal stitch as well as a link to a video tutorial.
Regarding Yardage, you will use most of the 380 yards of your main color but will have plenty leftover yarn in the accent colors.