Size 10, tag 12 but runs small, ivory chiffon sheath wedding dress

Size 10 ivory chiffon sheath wedding dress by Moonlight Bridal. NWOT - no alterations. Illusion tank neck & back line over tank straps. Zip back. Loop/button top. Excellent condition, never worn. Small sweep train. Beading on one side in silver to create buds/vine design. Style 1-652C, 100% polyester. Unknown retail price; Sites show starting $1000+. FLAT LAY MEASUREMENTS Armpits 18.5" Waist 15" Hips 20" Total length, shoulder to hemline 63" (unaltered)