No good answer to that: the most expensive women's suits are almost completely intolerant of chlorine.

I can tell you that very expensive women's suits are worse than moderate ones, and that suits with elastic (Lycra) are much worse than nylon board shorts or guard suits . . . and that 100% polyester competition suits last forever. But other than that, you have to experiment. However, if you are asking the question, I'd recommend separating your family's suits into "swimming suits" and "showing off suits". If you do that, you'll likely end up with the more chlorine resistant ones in the swimming pile.

I have some OLD (20 year old) data on grades of Lycra used in competition suits . . . and I can tell you that, at least back then, the most common Lycra elastic was sold on the presumption that women would 'slip and dip', not swim. I think the life expectancy was something like 5 hours at 3 ppm - and that the suit would last the summer. They didn't consider or test stabilized chlorine solutions.