Startup Idea : A 'Your Choice of Charity' Business

I've always loved companies that donate a percentage of profit to charities, but the problem I run into is that they donate only to a single charity of their choosing. What I would love to do is create a product that donates a certain percentage of the profit to a charity of the customer's choice! They can have three options, and then a fourth that is random choice! My business idea is to make and sell tie dye and screen printed shirts with the idea of 'Your Choice of Charity' implemented into the business. Is this something you think people would be interested in? Any questions or concerns, advice, critism, etc is highly appreciated. Thank you!!