Liz from Cotton & Curls used a zipper insertion to remove extra width from a boxy sweatshirt. She didn’t actually cut the fabric, so the zipper just makes a big pleat in the back. I love this! It gives the shirt a more flattering shape for your figure, and it also just looks cool. She used a standard zipper, but I wonder if you could use a separating zipper to make the pleat removable when you wanted a looser fit? Go to her blog to see how she did it.
[photo from Cotton & Curls]