Start with the 4" ribbon. Measure 12" tail and 6" loop on each side.
Next, take your 2.5" ribbon. Measure 12" tail and (2) 5.5" loops on each side.
Last, take your 1.5" ribbon. Measure 12" tail and a 5" loop on each side.
Take your pipe cleaner and tie off the center of your bow nice and tight. You can cut your tails at an angle or turn them in to dovetails. Fluff out your bow.