stays without straps?

Having got the advice that you don't need straps if you're small busted yesterday I started wondering if there is any evidence for stays without straps from the 16th century, or even before the 19th. The preserved ones from the 16th century have straps, an all 17th and 18th century stays I can think of (that are preserved complete), but I am not sure about the 18th century. And how about paintings and sketches? Granted, there are not many from the 16th century, and in the most famous she wears a jacket on top of it, but do you know of any other?