The basic dress in Fugazi1968's tutorial wasn't too complicated, but I am trying to map a pair of pants (for M4 figure) with a laced-up fly. The lacing runs thru eyelets, crossing on both sides of the garment (like a laced shoe) and is tied in a natural-looking uneven bow at the top.

How do I "seam" this? So far, my best guess would be separating the whole front from the back. I think I would have to then split the back side. I've done enough sewing to understand that rounded fabric areas, his bottom in this case, don't flatten easily.

Any suggetions? I'm just learning this part of the process!