White lace sleeveless blouse - dating help please?

I bought this pretty little handmade blouse on ebay several years ago - it's been packed away and I'd almost forgotten about it. I came across it again when looking for something else and am wondering just when it would have been made. It was sold as a 1960s blouse but my feeling is that it's older.



It's hand sewn in a white lacy material with a tiny bit of bias stretch to it, the sleeveless design with high cut back makes me think it was meant to be worn under a jacket. It fastens at the back with poppers/press studs.
Any thoughts on this would be much appreciated.