Does anyone have any ideas about finding out what a specific player's shoe size is?

I picked up some Rick Sutcliffe game used cleats. They are size 11, which in my opinion is kind of small for a person who is 6'7". After looking at some pics of him, he doesn't appear to have very large feet, but I would rather have some solid evidence that they were his. They do match the style in the pics though.

The woman I bought them from said the Cubs donated them to a charity auction and her husband won them in the 80's. They did not come with a COA. I'm not sure many things did in the 80's. I got them pretty cheap because she didn't list them well, so I'm not out that much if they are not real.

Anyway, please let me know if anyone has any ideas. Thanks.