Vintage(?) Peck & Peck Dress

I'm not sure why I own it... It's really cute but way too small for me. In really good quality, apart from a bit of wear and tear on the tag. I think a size small/medium.

Peck & Peck went out of business in around 1970-1980 (according to the internet), but there's no label on this thing with a manufacture date, so I'm not sure when it's actually from????