Foot size is static, embouchure is not. So, no valid comparison here. I started on Bach 1.5C because it felt best in the beginning (which is typical for a beginner: the "bigger the racket" the less shots you would miss). Although my anatomy hasn't changed since then I play much smaller mouthpieces by now - because my embouchure changed, my micromotoric system developed. Once you've watched Cat Anderson's chops and the mouthpieces he played you could have learned that there is no static, fixed relationship between chops size and mouthpiece size. .