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! :)