Many rain pants, jackets, and even light boots go over regular clothing. A quality rain suit should keep you dry if you ride your bike when it’s raining, yet it should also make it easy for you to take it off when the sun is back so you can then continue your ride with your usual motorcycle clothes.
However, there are rain motorcycle boots that can’t go over other boots. The ones mentioned above are more like some larger socks made of waterproof materials. You will also find light and comfortable one-piece suits that you can easily wear over your regular clothes and that are adjustable for a nice fit.