Burton does a "mid fit" in some of its pants that are cut slimmer but not too tight. You can filter their selection by fit on their site. I also tried their sig fit cargo pants and thought they were cut somewhat slimmer than other brands but still had enough room to layer underneath.
If you want an alternative, Ride has a slim fit option also that doesn't look too crazy.
Westlake Pant | Snowboard Pants | Ride Snowboards 2012-2013