[QUOTE=Angellight;7144838]I also do this, and if it is a curved area, I cut into the smallest line in several areas so that I can cut the pattern out with out cutting slices out of the pattern. I then iron the crisp line in to the size I need. When I need to make the larger size, I "un-fold" to the size I need and re- iron.
Good luck and happy sewing.
This is the way I've always done it. In fact my top is smaller than my bottom so I usually use two sizes when cutting out clothes.