This is a beautiful and unique piece! It seems to have been custom made and its hard to pinpoint the exact era but my guess is circa 1970s (could be from before though!) 

It is in excellent condition with a Gunne Sax like corset front lace up. 

Zips up in the back. 

33" adjustable bust

28" waist (but can be adjusted as it has straps)

Hips are pretty open. 

Excellent vintage condition