I just took my yard stick (it was wide as the strips I needed to make) and traced that onto the fabric. But I don't have anything that's 2-3 inches wide to trace onto the fabric
Use the yardstick to mark the width you want - make your first line down one side of it, then turn it, use the line you drew as "0", measure over to your width & make some marks at that width, down the length of your line. Turn the yardstick longways again & draw your line to match up the marks. I've attached a word doc with a picture....I hope it works!