In my experience, pleats work great on skirts for plus sizes, but less so on pants. An intrepid designer could prove me wrong on this someday. I have a vague memory of sewing pleats as a teenager â€“ I wound up unable to do it myself, so I have much respect for the tired fingers of the seamstresses that do do this. Besides, pleated skirts also have that satisfying swing quality that makes you want to spin around in them. (Please wear shorts beneath if you opt to do this outside of your own home. Locals can get strange about your underthings or lack thereof if you were not in an explicit agreement to share.)
Find your own plus size pleated skirts on Fat Chic clothing search.