Corsets:
Originally, the corset is an undergarment design in a way, that lady would have a body shape of the era (ex. Victorian era). In fetishism, the "role" of the corset ambivalent; for some, the corset represent the power of the female Dominant, for others, it represent the femininity of the female submissive.
-From its design, the corset is not an easy undergarment to wear, some, even believe the corset to be a bondage gear! Naturally, the corset, with stockings are possibly some of the oldest fetishism clothing and had have "admirer" for quite sometime!
In DS, there is an activity called "corset training" where the male Dominant will have his female submissive wear a corset long enough as a result, the body of the female wearer will have some of her inner organ displace by it, allowing her to wear tighter and tighter corsets.