I originally made the largest size for a friend's kid but he outgrew it so quickly. So I did my first attempt to "hack" the pattern and make a larger version of it (approximately a size 5 for kids). I looked up some tutorials on how to grade up; I cut up the pattern and added a few inches to make it wider and longer. I also enlarged the arm holes and draped the hood a bit longer so I could add an eye for a minion from Despicable Me 2.
The end result ...
|J modeling the bathrobe.|
|The hood with the minion face on top.|