The attached picture shows in black the original draft. So the problem is how can i make the length around the seat and along the crotch curve generous enough while still being able to slim the legs down. If I take the legs in I lose length in the crotch and as a result have to scoop it out more which only leads to less width in the seat because essentially I'm taking fabric away. The only idea I've come up with is to add to the hip curve at the back but then that curve has to come back in drastically to keep the legs slim. The final result being of that which is displayed with the red and blue lines.
It's no easy task to say how to solve this I understand so I'm not expecting anyone to magically solve my problems. I'm just asking for anyone with an idea to throw it out there tested or not as I've been banging my head against a wall to try to work it out and I am yet to come up with a satisfactory solution. Any help is great thanks.