So, while I think this is a very good idea, I do have to question the financial aspect of this project. 100 shirts each of 12 different designs will be made and sold for $40 plus $8 shipping. It states that 10% of the sale will go to the charity.
So, design number one, 100 shirts at $40 a shirt = $4,000. $400 goes to charity. $3,600 goes to whom? Let's assume that these shirts cost $20 each, using the standard mark up of 100%. That means the shirts cost $2,000, leaving $1,600 unaccounted for. Let's even give the benefit of the doubt that the shirts cost $30, which is high, even for that type of shirt, that's still $600 unaccounted for.
Now take in the big picture and take the above and times it by 12 different shirt designs in sets of 100. Who's pockets are being lined? State your financials.