Paper Crane Sleeveless Top Flounce Hem Blue Small?

Paper Crane sleeveless top. There is lace around top and down middle of front. There’s a flouncy hem. Color is a grayish blue. There are no tags, but it was snug on a size medium mannequin, so I think it’s a small or extra small. Please see measurements below. Item is in good pre-owned condition. Flat lay measurements: Underarm to underarm: 16” Shoulder to hem: 21”