Make a too-big t-shirt fit temporarily — no cutting or sewing!
Sorry about the crappy photos; I was in a hurry.
I was given these uniform shirts for my internship, but being 4'10", there was no way they were going to fit. I was afraid to cut them because I wasn't sure whether I was allowed to "deface" the uniform, so I found another way to make it fit better:
1. Roll up the sleeves.
2. Roll up the bottom hem to the desired length.
3. Gather the rolled hem in the back, and tie with a hairband.
4. Tuck the "tail" in.