Hello, I'm new to the forum, but not to tailoring. I'm a home tailor making things only for myself and have made a pair of trousers as well as shirts and a jacket. I'm about to start a new project based on a mod suit from the '60s, however, I can't wrap my head around how to sew or draft the back. It seems as though it has a set of vents and next to them pleats. Here is a photo-
Has anyone every seen something like this or have experience doing it? Any help greatly appreciated! The vent is on the left and the pleat is close to the center. It looks to me like the vent/pleat section is extra that is sewn on to a regular back that has been cut out for them.