Bogey, the kid concerned is 15 and has had puberty but no growth spurt in terms of height or feet size... He has been a size 6 for over a year. He was born prematurely and has always been tiny. He is almost the smallest child in his year and the smaller kid I can think of, has some sort of medical condition...
My older sons are 6 foot 2 and were close to that by his age. His brother who hasn't yet hit puberty, is nearly 2 years younger and the same height/bigger feet, if that puts it in perspective.
In fact the tiny 15 year old's self esteem seems badly knocked by his lack of height. I forget all about it then when I see one of his mates, it's a shock that they look almost like grown men. So his ego and self-consciousness is already fragile. He really loved these shoes because they were this brand and because we can't afford much nice stuff - only got these because of Jan sale discounts. So this is a small thing that actually boosted his ego, and is important to him - even though myself, his dad, and his three older brothers don't give a toss about this kind of thing; to him it is very important.
I think this is why uniforms exacerbate the differences between kids, in fact, because the only areas left for self-expression are stuff like the coat, shoes, hair dos, which puts even more onus on those things.
My older sons were all immune to peer pressure and are truly happy to wear £5 Tescos jeans - apart from one who has (hilariously because at school he never gave a toss how he looked) become a Tumblr fashion icon - go figure - he even gets recognised by strangers on nights out, and all he posts about are his clothes/piercings.
Still awaiting The Phone Call.