Expanding pants

Je
So I work in a law firm and have to dress business casual. Well I am feeling extremely bloated and even though I don't need new pants yet, I can feel mine starting to get snug at times. I get most of my dress pants from the Limited and like most dress pants, there is an inside button off to the side a bit and then two clasps on the outside. I have at times not buttoned the inside button to give myself a little more room, but does anyone have any clever tricks to make my pants last any longer? I am aware of the hair tie trick with jeans, but just wondering if there is something for dress pants as well.