Here is a vintage 1990s slinky silver cocktail dress from I. Magnin. Spaghetti straps, body concious fit, very cool material that is textured (thinly ribbed, almost-enlarge photos 5-8) with bursts of sequins throughout. Low back with zip and hook and eye. Black under-dress. In great vintage condition, with no flaws that I could find. I suppose some sequins could be missing, but it would be hard to tell, given how the sequins appear in bursts on the dress. Only the I. Magnin tag remains, so I don't know what the fabrics are, but the dress does have some stretch. I'm guessing this would fit a Small or perhaps a Medium (the mannequin is a 6/8). The below flat lay measurements are taken un-stretched.

Chest from pit to pit: 17.5”

Waist: 16.5”

Hips: 19”

Length from top of shoulder strap: 33.5”