Help dating jacket

Good morning!
I found this jacket in a thrift market, I loved the sparkling blue color and the red dots interior so I bought it. I guess this is vintage but I have no idea of the date. The boxy shape make me thinks of the '60 and the fact that it has no label and looks hand-made reinforces the idea that it could be quite old. The external fabric looks like a piquet cotton, while the lining could be rayon (viscose?). Finally, please, note that I bought it in Italy.
Could you help me dating it?
I hope the pictures are fine.
Thank you very much.

Cinzia