Have slips gone completely out of style?
For me a slip depends on the weight of the fabric, lighter ones I always wear a slip with. I also always wear a slip with white, but the slip, and panties are usually a beige / nude tone. White shows through any color underneath, including white, except for nude tones. I don't understand it, I just know it's true.
Slips have been out of fashion since the 80's, when they turned into outerwear, but they never go out of style under something unlined or in a limp fabric.