Full slips never really go out of style. There is always a dress or gown in your wardrobe that just demands a slip underneath. Full slip lengths are measured from natural waist to hem, so a 32"" full slip is ideal under long dresses or gowns, falling to low calf or high ankle on most women.
With modern fabrics, a full-length slip will feel silky again the skin and keep clothes from clinging. Most have a touch of spandex to conform to your shape without sagging or stretching. Sizing for some full slips is by bra size, so be sure to check the sizing chart when ordering.