Vintage knit dress

Bought this at a funky consignment store thinking it would look great with a cool pair of Frye boots or somesuch. Too small! Anyway, it's a cool (see-through) light gray knit dress. Braided belt. No size tag; it was sold as a medium but I'm going with small. In excellent condition. -shoulder to bottom hem about 41.5" -pit to pit 17"