I love the look of this wool sweater I found a few years ago, but it's an XL and too big for me. After putting up with the sloppy feel, I decided to try and alter it. I was ready to get rid of it, so I had nothing to lose if it didn't turn out.
The fullness under the arm was just too much to be comfortable.
I laid one of my favorite sweaters on top of it to get an idea how much of a seam to take. Then I turned the sweater wrong-side out and sewed it on the machine.
Here you can see the difference between the left side and the right side, which has been taken in.
I love it now! And such an easy fix. It really is okay to sew and trim knitted fabric.