Last year I picked up Pilot Motorsport's Omni Air Over Pants V2. I can wear them over my jeans, or a base layer and/or insulation layer, or my work slacks for commuting days. They have a rain liner too.
One system, slide worthy protection. I already owned the Pilot Trans Urban V2 jacket when I bought them, and the quality of the jacket was the reason I got these. Together I can't imagine finding a set that fits or functions better, they've been great for me, I recommend them to anyone who asks. I'm 5-11 210# 36 waist 32 inseam, they fit great. And you can get an integrated zipper suspenders for it too, they are pretty comfy.
I used to just ride with jeans, that was pretty dumb of me, then got older, had to learn how to be scared of "serious injury or death". So I wear these now.
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