Ninety-five percent of hip fractures in the elderly are caused by falls, usually sideways. A wrap-around skirt, worn on top of ordinary clothing and designed so that it's easy to take on and off, could significantly reduce the incidence of falls since it would act like a car's air bag, absorbing the impact. (Alternative idea: An air-bag skirt.)
Skirts could come in different thicknesses, depending on the fall risk. They could come in different colors, and be fun and fashionable while contributing to a sense of security. We need a different name than "skirt" for men, but the same concept would apply. Many men now enjoy the popular Loudmouth shorts - which gives some indication that men might have fun with this concept as well.