I will show you anyway, try to keep up.
I had this shirt for quite a while but it always was a little tight at the upperarms. I still loved the shirt so I didn't want to throw it out. Here's what I did to it;
Step 1. Take a good look at the shirt in front of you, do you really want it to be sleeveless? Make up your mind!
Step 2. Take a pair of scissors and cut the sleeves off.
Step3. Managed? Take a rest, you'll need it.
I don't know how this baby will turn out after washing it, but for now I totally love my new garment.