Donate them to charity as soon as possible. They're taking up valuable space that will need to be used for future Hero Hoodies.
Forgive them for feeling cheated by the hoodie industry their entire life. Embrace them like you embrace the sun.
Approach them slowly, and ask them if they'd like to see a better way. When they say yes, conduct a full on Quikflip conversion demo. Once the initial shock wares off, answer any questions they might have and welcome them to the family.