Make Your Own Toddler Undies

Like mom and dad, Sam is a little string bean.  There's pretty much no hope of this kid ever becoming a linebacker (thank goodness!), maybe a great runner or rock climber, but not so much anything that requires some serious bulk, including fitting into any training pants available in regular stores.  Sam's been using the potty since he was quite small, and we've had more or less success, depending on my diligence.  
As long as I remind him to go, we're pretty good at avoiding accidents.  But, I decided it was time to step it up a notch and have him start taking responsibility for it.  We were waiting for warmer weather, so I wouldn't feel like a bad mother letting him run around with no pants on.  Pants are a serious hindrance when you're under two and have to pee.  Unfortunately, when we went to the store, I could see at a glance that the training pants would be around his ankles and no use to us whatsoever.  So, besides 24/7 nakedness (which would be just fine with Sam!), what's a mother to do?  Stock up on tiny, cotton baby pants at the thrift store and turn them into wee toddler boxers, that's what!
The first pair ended up looking a bit more boxer brief-ish, but he still seemed to think they were quite the thing.  After figuring out the right length, I just lopped off the legs on the rest and sent them through the wash, no need for hemming or anything that labor-intensive.  We've got about a dozen or so pairs now. 
Is there anything cuter than teeny, tiny baby buns in teeny, tiny baby boxers?  I think not.  And so far, he seems to be doing a little better each day taking himself to the potty and not needing to be reminded.  Though I'm very open to any tips or tricks from experienced moms out there!  All the good books on potty training were checked out at the library, so I've just been winging it. We do have a sticker chart though...