In prep for winter riding in Seattle, I tried all kinds of wet weather tights (showers pass, castelli, 4ucycling, arc'teryx). These gore bike wear pants are the winner for riding in medium amd heavy rain. 34 pants are a non starter (castelli tempesta), showers pass skyline are a weirdly snug and short fit.
I'm 5'10 175lbs with muscular thighs. I bought medium c3 gore pants. This fit was just right as an over layer that isn't too flappy.
Ive used these a number of times in moderate rain with good results. They kept me dry and breath reasonably well, as well as any rain gear Ive used. I purchased them to use on a bikepacking tourthey are light and pack fairly small, they fit in a jersey pocket easily. They cut the wind 100%. The fit is cycling friendlynot too baggie, but not race tight fit either. If you ride or commute in rain, these are a great option.
Love the ankle zippers as I was able to pull these on and off over my riding shoes.
I am 6 foot and 170-175size large fits well.