Bestform was founded in the 1920’s in New York and has sold a wide range of foundation garments since then. In 2014 they became part of Ariela and Associates, a US distributor of lingerie to retailers. Previously they were part of Vanity Fair brands. Bestform in Europe is a separate company with a wider range of products. Here is a fun little video with an overview of the company’s history.
This all in one girdle shaper has extra support panels sewn into the mid-section and an adjustable hook and eye crotch closure with cotton liner. The wire-free bra cups have a horizontal seam and light fiberfill padding. The straps are non-stretch except for a short elastic section in back and they adjust in front. I have no information about this product- my guess is that it may be from the 1970’s.