Slips - the successor to the Edwardian princess line petticoat and  the chemise.  From the late Teens /early 20s, this is a lightweight undergarment worn over the foundation garment or bra and panties and seen in silk, cotton, rayon, nylon, and tricot. The slip is usually made with narrow straps and covering the body from the bust to the fashionable hem length and was often made taffeta or satin and in matching colors for sheer dresses. Basic tones of white, beige and black with lace trim were most common. Red was seen as a 'racy'. choice. In the  1920s the fit is tubular and loose, and the slip is rarely trimmed In the  1930s, slips were often bias cut and usually plain in appearance By the 1940 and 1950s the bust is defined and more likely to be trimmed with a variety of lace and fabric techniques. In the 1960s the length is  shorter as needed and the  fit smoother, although often in bright prints. The slip dress is simply a dress that follows the lines of the slip but is made in fabrics and weights to be worn as an outer garment. The Half-slip is a waist to hem version of the slip, often with lace trim, slits for walking and an elastic waist. Hem width varies according to fashion . The  half-slip is worn with a camisole or bra. A bra slip - a slip that combines a bra top with slip, from the 1950s and 60s on.

1920s Silk crepe & net slip, courtesy pastperfect2	1930s Crepe bias cut slip,courtesy pastperfect2	1940 Barbizon Slip,courtsey of pleasurequeen
1950s Gotham Gold Stripe Slip, courtesy dancingdresses	50s Charmode Cotton & Wool slip, courtesy alonesolo/fashiontales	1950s Lace slip by Aristocraft, courtesy worth-a-peek
1960s Pucci Formfit Rogers slip, courtesy fuzzylizzie	Henson Kickernick half slip, Note the kick slit in front courtesy of alonesolo/fashiontales	1960s Pucci FormFit Rogers slip dress, courtesy fuzzylizzie
Bra slip from St Michael, courtesy of Noir_boudoir	1950s Cotton strapless bra slip, courtesy pastperfect2