Would you like a totally free t-shirt? There's a short quiz on the TonGildan website, and you have to answer a few questions. There are no right and wrong answers to the questions, it's more of a survey than anything.
After about 6 questions, you get to fill in your details where it says:
Please fill out the form below so we can delivery your new Gildan t-shirt. Once submitted, you will receive an email asking you to confirm your email address, this ensure that we deliver to the right person.
The quiz assumes you already own a Gildan shirt… so even if you don't, I'm sure you can choose some appropriate answers.