Referring to shoes as "pumps" dates back to the 1500s, when men and servants wore shoes without heels known as "pompes." From there, the pompes evolved from the plain, flat shoes worn by men to embellished, heeled shoes worn by women.
Sweat can be the cause of smelly feet, but sweat alone is not usually the cause of odor. The interactions of the bacteria Staphylococcus epidermidis, Bacillus subtilis and Brevibacterium linens on the foot are the main reasons behind bad-smelling feet. The foot can smell from the interactions of one of the bacteria or all three.