* Provide a smooth base: Slips prevent dresses from clinging to the body, especially under dresses with delicate fabrics like silk or chiffon.
* Offer modesty: Particularly useful under dresses with sheer or low necklines.
* Enhance comfort: Some fabrics can be itchy or uncomfortable against the skin, and a slip can create a barrier.
* Add layering and warmth: In colder weather, a slip can provide an extra layer of warmth.
So, while there isn't one specific name for "the dress" she wore underneath, the general terms are slip or camisole. She likely had a variety of styles and colors to coordinate with her outfits.