Pinterest inspiration shot.
I have to say that I wasn't wholly invested in the idea of ironing out freezer paper and cutting things perfectly. So, I cheated and used blue tape that was handy for more of a... rocker look.
So here is A's plain T.
Add some tape and back with a plastic bag.
Load spray bottle with bleach, and spray the heck out of it in mist and direct spray.
Let sit in sun until mostly dry. Remove tape, rinse, wash, and then dry. Place on moody pre-teen and the look is complete.