Gap Strapless Black A-Line Party mini Dress Size 4 Silk blend Empire Waist

Gap Women's Strapless Black A-Line Party Dress Size Silk Cotton blend. Good preowned condition. It’s has a side zipper & is above the knee length. Very soft material and very flattering. No size or brand tag but its a little big on my size 4 manequin and its a little too big in the chest for me and I am a 34B. I'm going to guess this is a medium or around a size 6. Approximate measurements laid flat: Waist: 14.5" Pit to pit: 16.5" Armpit to bottom hem: 33"