I wanted to do some alterations to the shirt I bought a couple days ago.
The problem is that it was too big under the arm, all it needed was to be taken in a few inches.
What I ended up doing , is folding in the sides to make it the correct size and sewed that together.
It didn't bunch at all, and it lays correctly.
I tried it on , and it doesn't hang off me like it was before. I'm happy with how it turned out!