vtg 60s VICTOR COSTA faille cocktail dress sz M *flaw

Vintage 1970s Victor Costa black faille cocktail dress. Midi length. Triple strap detail. Shaped top, gathered skirt. Boning at sides. Center back zipper. Detachable tie belt. ****there is an area of discoloration on the front skirt, at above knee level, see last photo. No size tag, fits size M/L. Garment measurements– bust: 37″ waist: 28″ hips: 42″ front length from top of strap measured straight down: approx 43″