"Foundation garments" refers to undergarments like bras, underwear, or shapewear that provide support, shape, or help improve the way outer clothes fit and look on the body. Full definition
Before you go shopping for that all important foundation garment to fit under your favorite vintage style dress, we thought you'd enjoy reading some excerpts from a 1948 lingerie and foundation wear guide. (glamourdaze.com)
«You'll feel ten times better with the right foundation garments. (redbookmag.com)
Starting from the bottom (layer) up, this is the year to wear bras that really fit and support, undies that work and «foundation garments» (as my mother would call them) when the outfit calls for it. (thefashionablehousewife.com)