I’d go for pants that are either easily taken off, or more discreet ones to keep on all day.
I dont know this for sure, but my guess would be that the material used in the discreet type of pants wouldn’t hold nearly as long on asphalt as ‘real’ gear would.
I’m sure I’ve seen MC pants with zippers all the way down the legs for easy on/off’s
If you still wanna go for the all-day-pants and like jeans, check out draggin’ jeans http://www.dragginjeans.com/
They seem to be of good quality (according to dealers) and are throughly tested