I shredded that sleeves of the tee and of course,the back.
It's my first attempt so at the back of the tee,it kinda went up like a triangle instead a a straight column.
But I tried again at the sleeves and it went well =)
Cut off the seams of the sleeves.
Stretch it so the seams are loosen and can be seen clearer.
Start pulling the 1st thread down.This decides how wide you want the shredded area to be.Pull it out longer if you want it wider.
Repeat this for the other threads and slowly do it all the way up.
Remember to ensure all the threads are pulled fully to the side(to the desired width) or else you'll end up with a pyramid.
I find that putting my feet inside to hold it stretched is easier.