To be worn, when it rains. Even when not. There are shoes, socks, trousers, shirts, shorts, slips, sweaters, jackets, even suits made out of that, or functionally equivalent stuff. Another option would be something very light to pull over, which you carry with you at all times, crumpled or folded into a volume of maybe two matchboxes, single- or multi-use. Much cheaper than than the goretchy parts, btw.