Blue strapless formal gown

Like new, worn once. No flaws. Blue, satin type material. High slit, sweetheart top, lace up back and zips. Size small from a boutique (runs large). I’m 5’7” , 135lbs. Had the waist taken in some and hemmed. I wore 2.5 inch heels. Can be tightened or loosened due to lace up. I’m a size 4-6 in street clothes