Replying to Question on SMS pant sizing...yes I searchbarred

Like the title says, I DID try the searchbar, but most/all of the questions were about XL or XXL stuff, so it didn't help much. I'm 5'6 125, and wondering if I'd need a medium or large if I got the SMS Mrider pants. I don't know much about pant sizing, but my Burton pants in small are pretty tiny, and are too small even if I were to like sag them to my knees. I want something that I can wear comfortably high and still be baggy, but not like enormous. For an idea of how big I want them, I want them to about match my coat in fit/baggyness: This is my Medium SMS puffer that I want to match in size Thanks...Ian