Hugo Boss Notch Neck Grid Check Sheath Dress in Dark Gray Size 10

Classy, flattering dress in good pre-owned condition with no stains or rips. Cap sleeves, fully lined, dark gray with cream grid check. There is no size label, but measures 18 1/2 pit to pit, 16 inch waist. These coincide with Hugo Boss’ measurements for a size 12, but I have other HB size 12 dresses that run larger: I would say this fits more like a 10. Please check measurements!