The dress is probably a size large but with the belt, it can be cinched in for a smaller size. It is in good condition, but the sleeves elastic cuffs are a bit stretched and worn.
Approx measurements are:
16-1/2" shoulder to shoulder
22-1/2" armpit to armpit
23" bust
23"waist
24" hip
43" should to hem
43-1/2" long belt