Do you have any references for surgeons using any type of apron? If you do a search on here there are several discussions about them. There is only 1 picture showing a surgeon with an apron but that was a staged picture. If you have any accounts about them we would love to see them. As to Godney's apron, yes its way 18th century. By the mid 19th century about the only ones using leather were blacksmiths, farriers and wheelwrights.
your obedient servant,
Surgeon, 2nd Brigade
"not really a surgeon, but I did stay at a Holiday Inn Express"