Shirring is a gathering technique, but very different from pleating. It's a key design component for both the the 24/7 Pants and the shorts with three main functions:
I like wearing shorts, but I was really tired of running shorts being the only comfy option - especially when I'm not wearing them for running (or, in my case, shuffling). I hate how the elastic gripped my waist and how I had to sit a certain way so I didn't accidentally flash people. No one should have to change how they hold their body to be comfortable in their own clothes!