Description - Sexy sheer black shapewear bodysuit bustier from the 80s. The lace straps and garters are all removable. The only opening is at the crotch and there are 2 rows of hook and eyes. There is an underwire in the bra and boning in the bodice. 

Descriptions from several 1981 ads that I found: 

Now, the newest addition to the Young Smoothie" shapewear collection - LA SHAPEUR. A chic underbare, with lavish lace trims, removable shoulder straps, underwire cups and front panel, and removable lace trimmed garters. LA SHAPEUR joins the Young Smoothie "Skinny Waist" collection in providing the comfort, control, and fashion you want in your shapewear.

Young Smoothies shapes pleasant dreams in a most feminine fashion. "La Shapeur, strapless tor solette is clipped lace on a sheer power net body with underwired cups and convertible straps.

CUT A ROMANTIC FIGURE WITH "LA SHAPEUR" TORSOLETTE. The newest under fashion is an elegant and nostalgic French Torselette by Young Smoothie®. Lightly boned and extravagant with lace...to wear with or without straps, with or without the garters. Of nylon/Lycra® spandex with underwire seamed cups,

Details

Brand -La Shapeur by Young Smoothie

Content - Rigid 100% Nylon Elastic 80% Nylon 20% Spandex

Size - Labeled Size 34B

Chest - 13.25" pit to pit, stretches to 16.5"

Cups - approximately 7" across, approximately 5.5" high in center

Waist - approximately 9.5" across measured flat and stretches to at least 12.5" but might stretch a tiny bit more

Length - 23" or 23.5" from top of cup to crotch

Shoulder to Crotch - 27.5" or 28"

Condition - Brand new with tags