I laid a straight ruler from the outside edge of the knee and square with the hem. I drew a line and repeated on the inside edge. I stitched on this line, taking in 7/8 inch on either side. I don't know if in the picture there is much visual difference, but my hems don't flop around the way they used to and when I look in the mirror, things look more proportional. Then again, I could be fooling myself, but I figure one purpose of a good fit is to help the wearer feel better about themselves and that purpose has been accomplished, so this alteration was a success.
I didn't take out any stitching on the side seams, so there is a tiny divet on the side of the leg with the flat fell (?) seam, but I don't think it is noticeable unless you are examining the trousers and I'm the only one who does that. These trousers are getting old anyway with thinning fabric and fade marks at the hem - I have to wear "professional" clothes, but my job also involves crawling under tables and moving dusty equipment. Not so good for the longevity of the trousers.