I have size 15 shoe, and I have never met anyone with a bigger size. Is that the same sizing as in USA? Or, is that some British metric size shoe size system?
In the UK I wear a size 15UK but in the USA I take a 16EE shoe (measured in Nike store, ECCO, North Las Vegas in Aug 2010).
I actually have a 15.5 left foot and 15 right foot (UK sizes) but most size 15UK/50EU shoes fit OK with the left feeling a little tight.
When I get to the US it's great as I can visit a regular sneaker shop and get really comfy shoes, where here in the UK I have to visit specialist BigMan stores or order online and return those that don't fit.
Hardest was always motorcycle boots, but recently the manufacturers seem to be waking up to people with big feet.
My last pair were Alpinestars Andes (good) and current pair are Held Annone (excellent but SNUG!).
I cannot wear thick socks with any of my footwear.
I met someone years ago with size 21 feet. Made mine look like kids feet <LOL>.
He was 7'2" and had HUGE hands. He was a basketball coach and ex-basketball player.