I used to be 5'10", but by last physical had shrunk to 5'9-1/4". (Consider the truism, The Little Old Man. Is the man old because he's little? Or is he little because he's old?) But I still put size 11D, or less commonly, 11E on my mismatched feet. Right foot a bit more than 10 1/2, left foot a bit less than 11 1/2.