When choosing a non-stretchy pants for the office pay attention to the following factors:
The waistband should not be tight; you want it to sit naturally on your hips not too tight or too loose.
The vertical seam is situated in the center from the crotch to the top of the waistband. Make sure it covers your belly from the front and isn’t revealing when you sit down.
The fabric should not be pulling horizontally at the hip level. If you see horizontal lines, you need a bigger size.
If the pants have pockets, they are not pulling either.