I think this is only the second article of vintage maternity clothing I have found, in 30 years of thrifting! No flaws! light and summery. Feels like rayon, and easy to iron like rayon. No tags other than the one pictured, which says this is a size 20. 5. maybe it is just a large, considering the zipper is in the back, and what pregnant woman wants to deal with that?!? I love the two large accent buttons, and the extra layer of hem, at the bottom. Very pretty paisley design! Metal zipper. Go by measurements.
Bust: 45"
waist: 45"
shoulder span: 16"
length: 23

This item is sold from a vintage boutique in Las Vegas, Nevada.