Island Cargo Honolulu women's dresscap sleeveelastic waist with fabric beltNo size tag in garment.  Based on below measurements I estimate it to be a small/medium.  Please check your own measurements against these for best fit.

shoulder to shoulder 15.5"underarm to underarm 18.5"top back of dress to hem 43"waist: 32" (stretches to 35")

condition: 1/4" square fray on back, near where you would belt dress. see closeup pic.