Talbots a-line sweater swing dress sz MP blue

Talbots a-line swing blue sweater dress 3/4 sleeves Back zipper closure 72% rayon, 28% nylon Machine wash cold Good pre-owned condition-no stains, tears or snags.  Missing size tag.  Size is approximate, please see measurements.  Measurements while item is lying flat w/o stretching:Underarm to underarm: 16" Waist across: 15" Hips across: 18" Total length: 39" Length from top to waist: 17" Shoulder to cuff: 18" Items cleaned and stored in a smoke-free, pet-free home. Thanks!