Did you lose a lot of weight? This is common when someone loses a significant amount of weight or could be from more organic reasons.
The legs are shifted on the pattern creating more length over the inseam and a shorter outseam. This will allow the trouser to follow the line of your leg and drape in a seemingly natural line. The tailor needs to see you to know how much or to what degree to swing the pattern. If you were bow legged the pattern would be shifted in the opposite direction.
Yes, I was heavy for the majority of my life and then through diet, and lifestyle change I lost 100 pounds. I am forever striken with crooked legs. But this is interesting, can it be done as an alteration, or will there not be enough seam allowance?
It is shifting the leg and not related to outlets. This can be done by altering but the results will vary due to limitations of the finished garment.
When cutting the trouser both the front and back panel are shifted towards the ouseam. As an alteration you can only shift the front panel which will help some, but not give you the full effect/benefit.