Has anyone ever done alterations on a sweater knit??    I had to take in the side seams of a skirt for a customer because she wanted the side seams narrower down to the hemline.  I used wooley nylon in the bobbin, a yellow band needle and a short zig zag stitch..  After pressing, the seam looked great.  However, once she put it on,  the seam indented on both sides about 3/4 of the way down.    I thought perhaps this type of fabric should not have been taken in until I saw a ready made sweater knit dress that was also narrower at the hem than at the hip line and it was perfectly straight.  I then sewed seam tape on each seam hoping that would keep the seam from indenting, but it did not help, it actually looked worse.   I doubt I will ever take another job involving sweater knits again.   But, I am really hopeful someone out there has had a similar experience and can explain how they dealt with this problem.