Never worn Reformation Vanessa dress, black with floral, size 6. Slit in the front, and button back. Loved this dress so much, it’s really flattering, but it’s just a tiny bit too small in the bust for me. I am 5’3”, size 4/27, 127lbs, 32F and usually between a 6 and 8 in Reformation. I would say this fits true to size for reformation, maybe a little small.