How to keep the pants from getting dirty If it is wet, not necessarily pouring rain, it is easy to get the bottom of the pants and the shoes dirty. My tires have protective platesfenders, yet it is not enough. If there a way to avoid that?
Protective plates?  You mean Fenders/Mudguards?

I can think of 3 things that could help, other than simply bringing a change:


Bigger fenders (wider, and/or go down the tire more).  Basically, some fenders are better than others. A front fender that's wider than the tire with a stay (rod) going back for support that hugs the tire fairly closely  and extends down to the height of the bottom bracket is ideal.
A mudflap hanging from the bottom of the front fender.  This is a flap made of something flexible (rubber, leather, etc) that hangs from the bottom of the fender.  It effectively extends the fender down even further without it being a problem if it hits something.  Some fenders/mudguards come with this. Or you can add one.
Protective pants over your regular pants.  I have a pair of yellow rain pants that I put on over my regular pants when cycling in the rain.


Nothing will be 100%. It's always possible to get splashed by something else from the side.