Vintage 1960s Unique Mock Neck Pinafore Twofer Pleated Balloon Gogo Dress

Good gently used vintage condition. The straps are safety pinned onto the inside? I can’t imagine it came like this originally, but it’s how I got it. This is obviously not noticable while wearing, but an easy sew stitch if you want to mend! See zoomed in photo.   Fits like a modern day small. My mannequin is a modern day small size 4 and it fit like a glove, but with no room. I would say this is more like a modern day 2. I’m going to list it as both an XS and small, since it’s kind of in between, but there’s only one available. See measurements below.  Laying flat, measuring across, UNSTRETCHED:  Pit to Pit: 16” Waist: 15” Hips: 17” Length: 32”