It's not a waste. (sorry, had to) Perform some simple arithmatic and you can have the kind of waist shaping you want, where you want, on any sweater. The opening music is the same as my promo.
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Here are some photos of what I'm talking about:
The whole sweater.
The right side, showing the curve and that the sweater needs to be washed and de-pilled after a week of hard wear.
This is just the decreases, the sweater has been folded to put the "seam" stitches in the center of the picture.
From the same angle, showing the shaping from beginning to end.