Let's begin!
Step One (photo right)
Lay your most true to form tank top or shirt over your sweater (inside out)
Step Two
Pin your shape around the shirt allowing a half inch of extra space along both sides.
Step Three
Try the sweater on, leaving it inside out. Adjust the pins as needed.
Step Four
Use a straight stitch to sew along the line of you pins.
Step Five
Remove pins and cut along the side of your straight stitch leaving a 1/4" of fabric.
Step Six
Zig zag or serge edge to prevent fraying.
TAaaaDAaaaa!!! Flattering sweater... to rival the Sweater Girls. Just stay away from the "Bullet Bra"... ;)