Elizabeth - Since I am trying to stay ahead of a quickly growing boy who doesn't need them until May, is there any reason why I can't put the waistband of the trousers from the boys pattern on last? Does it need to be on earlier for construction purposes? It just seems like if I wait, I can get everything done on the trousers, set them aside, and put the waistband on closer to the event when I know his waist won't grow too much. Will this cause me lots of problems?
ETA: I also just got stuck on the back plackets. The facings that I cut are 4" (according to instructions) and the placket extensions are at least 6". Do I line the facing up with the waist or the bottom of the placket extension? Am I supposed to cut longer facings to match the extensions or is there supposed to be extra at the top for a waistband seam or something? I'm really confused.