Vintage formal gown

Turn heads in this stunning vintage Mike Benet Formal gown. Ruby red sequined bodice with smoky clear small beads accentuating the waistline. The one shoulder bodice flows into a long a-line skirt with side slit. Zips in back. Very good condition for vintage- all beads and sequins seem to be intact. No size so please review the measurements. I think the material is silk but it is not stated on the tag.