A flattering fit is especially important in a pant. We spend quite a bit of time searching for that snug, derrière-hugging fit you find in jeans. Trousers are a whole different story. They are a more formal pant with a smooth line and fluid fit. It’s jeans, and the casual pants like them, that cause us to spend hours trying on pair after pair. No one wants a saggy bum. So here’s the trick: If you look at the pattern piece for a pair of these types of pants, the back inseam seam ends up on the bias. With this fit trick, we are going to exploit the bias’ natural stretch.
Once your pattern piece is cut you are going to pin the inseam together from the bottom to the knee. Then clip about an inch off the top of the back inseam at the crotch. CLIP ONLY ON THE BACK. We are not looking to drop the crotch, so we need that front inseam to stay put. Clipping the back crotch seam will make the back inseam shorter than the front. Not to worry, this is a stretchy seam, and we are going to make it act like a bias cut dress.
Now that you have clipped away the back crotch a bit, grasp the top of the cut seam only, and the seam at knee, and stretch just this portion so that the top edges meet again. Continue to assemble your pants as usual. Voila! A snug, sexy, flattering derrière through clever use of bias! Now go make a pair. Happy sewing, and happy head turning!