Modest Retro-influenced A-line dress w/gathering

Note: Size listed is my best guess, as there is no longer a tag. Use measurements below to help you determine if it will fit. Measurements when laid flat: Shoulder span: 18" Armpit to armpit: 19" - 20" (little bit of stretch) Shoulder to Under-bust seam: 12" Under-bust to waist: 5" (at widest middle part) Waist to bottom hem: 26"