This is actually a shirt I made long ago in high school but I made it with non stretchy vintage fabric from Goodwill, and I wasn’t (and still aren’t) that great of a sewer.  So anyway it never really fit that great.  I was fine everywhere but the bust.  I kept it all this time because I love the fabric and I recently got an Idea on how to fix it.

The before

I took out the side seams and bought some white stretchy fabric.  I cut the fabric in to strips about 2″ wide and folded and sewed it into a loop. Then I cut the strips about 8″ long.  I made the bows by tying a knot in the strips and pinned them to the sides of the shirt.  After I knew how many I needed and had them spaced evenly I could sew them in.  The shirt is nice and loose now and has some stretch in it!