I'm using Kwik Sew 3115, a TNT pattern in my stash. According to my measurements, I cut a size Medium. My waist is between M and L, but I'm hoping to lose a few pounds now that I've started working out with my son. He keeps me motivated. This fits me well enough for now and maybe in a few months, it will look a little smoother as I get into better shape. It has a loose comfortable fit and doesn't cling.
This pattern is really easy to put together and can be done in just a couple hours. I used a drawstring waistband elastic instead of regular elastic. It gives it a more RTW look. Pull the cord out before sewing the ends of the elastic together for obvious reasons... And make eyelets on the waistband to stick the cord through.
Here's what the waistband looks like from the inside before sewing it onto the pants.
And here's the finished pants. Comfy and ready for a workout! :)