Um, trapthavok, are you perhaps talking about rise? That's the distance between the waist and the crotch.
Since you are a biofem, I'm assuming that you have a fem pelvic girdle. If you choose pants with a regular rise, you might want to choose a waist size that is an inch too big and, correspondingly, an inseam that is an inch shorter than usual so that you can wear your pants a bit lower, more on your hips than your waist. This should give you a a more masculine look, since men and women tend to wear pants differently, and it should provide a little extra room in the crotch for your packy. Give it a try in the dressing room.
And don't forget to allow for shrinkage. Of the pants, I mean, if they are cotton--not the other thing (if you watch SEINFELD). 😉