GOOD LORD! I thought I had it bad with 12's!
Growing up, my Dad always told me, "Son, if you ever grow into those feet, you're gonna be one helluva man!"
Size 15 is not so difficult if you are a D or greater width, even a C is pretty easy. It is virtually impossible to find 15 in AAAA. Imagine how bad it was prior to Internet. DH spent several hours, a few weeks ago, looking on internet, around the world, looking for a closed casual shoe in his size. He didn't find anything. We get his Birkenstocks from Germany, usually. (We went through a few pairs before I put the "fence" around his Man Cave; puppies ya know. And they didn't use to come in size 15 nor extra, extra, extra, extra narrow. No Crocks for him either.) Dress shoes are a little eaiser to find but he wears them so infrequently a pair will last decades unless they find their way into a Bub mouth.
DH's hands and fingers are long and skinny, too. Helped playing Flamenco but he was slightly handicapped, he says, by his little fingers being much shorter perportionally. He's just spoiled, I think, with eight extremely long other fingers.
When I played violin both little fingers would lock up. Now that's a handicap.
Hugs, Feisty Alice