--Vintage 30s/40s green wool sleeveless sheath dress.
--Well-made with attention to detail. Embroidered name label on inside.
--Button and snap closure on front.
--I would call this a modern XS/S, but see measurements for fit.

Measurements (lying flat):
Bust (pit to pit): 16.5"
Shoulder to shoulder: 15"
Waist: 15.5"
Hips: 20.5"
Length (top of shoulder to hem): 39"