Due to a pituitary issue when I was younger I have maybe a bizarre world record of the smallest feet and hands on a fully grown man. My feet and hands are normal looking but very small. They were tiny as a baby and just never grew that big. Thought you all would find it interesting - I know it makes for good chat at parties!
That’s not how that unit works. American shoe sizes are based on the size of a barleycorn! It’s not weird and confusing or a pointless, arbitrary tradition that should have been replaced years ago or anything!