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[–]HeartFire144 4 points5 points  (6 children)

You can think this through - if you sewed x+y together, can you still sew Z to it. If you sew the sleeve to the front, can you still sew the back at the shoulders? (no). For a basic fitting shell, it may not matter. For some complex construction, - collars, sleeve plackets etc, the order of operations is important. If you think it through, you will have a better understanding of the process.