Not sure if it's exactly what you want, but I would suggest looking at the pants in Simplicity Easy Chic #5792. They're wide legged, side zipper, no pockets, and no waistband. To lower the waist, you can just move the facing down. The legs don't have cuffs, but that would be simple to add. Try out a test pair from scrap fabric.
I use this pattern for all my work pants, with the legs slightly narrowed and an extra inch in the back of the crotch. My waist is a size 8 and my hips are a 10 (today's sizing, larger in the pattern), so it's impossible to buy pants which fit off the rack. After a couple test pairs, the first of which was hilariously not right, they're real easy to sew. Most recently, I made two pairs out of a cotton/polyester double knit which drapes nicely but feels like I'm wearing pajamas at work