You can't go wrong with an elastic-cuffed sweatpant. The hem on a Medium on American Giant's pants measures around 8", with a small going down to a 7.5", so they fit slim, but not super skinny. It's a cleaner silhouette than you'll see on usual sweatpants offerings.
Philippe says: "We chose to use elastic cuffs for a more classic sweatpant look. We have to source the elastic, which is another component we have to do, but it ensures a more versatile fit."