These are supposed to be a surprise for CARSON! but they are so effing adorable I have to post a picture right now.
Monster Pants! With monster face on the butt. They should make this pattern for adults (at least for adults whose butts are not ginormous, don't want to terrify the children).
Meg, I think these should fit your little Stretch Armstrong. The sort of bad part is I made them using wool yarn -- very nice and warm but have to be hand washed and dried. Oops. Just rip them off before he poops.