Took DS(13) to get new trainers after he said that his school trainers were rubbing a bit.
When we eventually found a pair that fitted they were size 8s. He had walked into the shop in size 5s! How the heck did he manage? I can only assume that he folded his feet up before putting his shoes on!
Basically he would rather be uncomfortable than inconvenienced by having to leave the house and go to a shoe shop.