OP, I think you might be looking for more of a loose fit, rather than a slim fit.
Lotsa kids here sporting their not-so-steezy nut-huggers out on the hill these days and could possibly point you in the wrong direction.
As for my contribution, I would recommend Quiksilver as they've never been overly baggy, but more fitting and loose and always comfortable.
A dream is what you wanna do, but still haven't pursued.
I know what I want and am doing it 'till it's done,
so I've been the dream I wanted to be since day one.