I guess it would have been thick sanitary pads for light leakage, and for those with more severe incontinence (which must have been common, and less treatable, back then) it would have been adult-sized terry nappies and plastic/rubber pants ordered from medical supply catalogues. It wouldn't have been a happy existence, with rashes, smelling of urine and the obvious bulk of the nappies, so many of said women would probably have rarely left the home.