Oh yes! Very illegal!
Dustina, re sizing for others: I'm in the same spot. I'm knitting eleven pair for dh's family for Christmas. (So far I have one clog done...I still have time...
Anyway, I'm felting these myself so that I don't have to explain how to do it. I'm in the process of getting everyone's shoe size, and then using this guide
during the felting process. I'm going to go up probaby half an inch or so when the clogs are wet to account for any shrinkage during drying. The measurements are accurate--I wear a 9.5, and my foot is a little over 10 inches long. I hope the guide is useful to you!