Black linen racer back tank top/ micro mini dress with silver studs, circa very early 1990s, by Popy Moreui of Paris.
26 pairs of silver snaps are actually 52 silver studs, and can be used to snap up the mid section of the mini dress, creating a sculptural tunic length tank top.
Two more snaps are on the right front neckline strap.
Slight cocoon shape to the piece.
Marked size 40, equivalent to a US XS to Small.
In excellent, if not flawless condition, ready to debut as a mini dress or super cool tank!

Clothing designs from this label are rather scarce and highly sought after; a bit more info on the designer:

Measurements:
33.5" chest (16.75" across)
26" length (as a top, with all snap pairs engaged)
as a dress- 39" hips, 37" hem circumference, 31" length