I bought the patterns for these pants off Etsy, my new favorite e-browsing spot! The cream-beige and black and white arrow print are made from the Maxaloon pattern and the striped one from the Monsterbunz pattern. My hubby thinks the pattern names are silly, I think they are cute silly. By the way I created the arrows print with a Sharpie permanent marker. I'm sure it will fade over time, but it's set on the fabric, it doesn't "bleed" or "run".
I have no idea what that white stuff on the waist and bum of the pants is, maybe I had flour on my hands while carrying him?