i have this handmade vintage sweater I purchased from an estate sale, all of the clothing there was pretty old but I’m having trouble dating this one because all I have is a tag that says “handmade by Jean Marie” No care label or fiber content. That’s the only label. I’m new to this so not experienced at reading fonts. Looking at the colors I think 60s because of the bright colors and lack of other tags, but how can I be sure? Anyone have insight?