The black dress with a classic cut for special occasions

My mother-in-law gave me this black dress for me to sell. There is no label and think she had it custom made. This is a long dress in black with a « V » neck décolleté. She said she was a size 6 at the time. There is one layer of tulle underneath the skirt. Long sleeves. Zipper at the back with a hook. Used but in good condition. Comes with same fabric as the dress black sash for the waistline.