I have a couple pair of Asics running pants... They are stretchy but not tight with legs that taper down to an elasticized cuff that opens and closes with a zipper.... They are warm but not too warm for cool days... I'm hoping that they never ever wear out because they work great on the bike and they're very comfortable. (I wear bike shorts under them)...
They are clearly 'athletic wear' -- but not so extreme that they look out of place when I wear them to the grocery store of whatever...
Unfortunately I bought them a number years ago. I don't know if they are still available...