Where and how do I add 2-4" ease to a shorts sloper pattern? I'm thinking maybe of making 2 vertical slashes to both the front and back pattern pieces. If I do that, where is the best place to make them? Is that even the right approach?

Background: I downloaded pants/shorts drawing instructions from patternsthatfityou.com. In making them, I added a front yoke to accomodate my big belly per an old copy of Gale Griggs Hazens book, "Fantasic Fit for Every Body." My test garment still needs a few tweaks, but in the meanwhile...

I want to experiment with semi to loose fitted super-casual (like for bicyling, but still OK to wear to the grocery store) out of light to medium weight woven cotton. They will have an elastic or drawstring waist.

My main question is, how does one add ease to a pants pattern.

Thanks!

P.S. I tried posting this question earlier, but I either screwed up or there was a delay. So this may be coming up twice.