Help dating this dress

[Lulu Poppins]

Hi,

I never had a dress like this. Can somebody please help dating It?

It has metal zipper, the bib is just sewn above, not in the bottom. The sleeves are straight and have this flared sewn to them (It's not a flutter sleeve itself). And the zipper is metallic.
I think It's handmade because It doesn't have any label. The fabric looks like cotton to me.

Here are the pictures so you can see It.

Thanks.

 

[MagsRags]

My first instinct says a theater piece or something similar, like for historical reenactment.

 

[Vinclothes]

I agree with Maggie, It very much resembles dresses I found that had been made for historical celebrations. Maybe 1970's. If homemade, as it appears to be, a metal zipper may have been in the seamstresses supplies.
Marian

 

[Lulu Poppins]

Thank you girls, I was thinking It was 70s, but I never find more old clothing, so was hesitating also for the zipper. It makes sense that It's as you say, I also see a renaissance style, that's why I was confused. Fun for me to find my first historical celebration dress ;-).
Thank you!