You can actually build a Tshirt business online without any investment. There are three different models that allow you to start Tshirt business with zero dollar investment, viz. dropshipping, affiliate marketing, and print on demand. IN all of these business models, you do not have to spend money on products. With dropshipping, you can sell Tshirts from some companies without having to procure tshirtts or even shipping tshirts. With affiliate marketing, you send buyers to trhe store and earn commission on sales. With print on demand you create your designs and sell these designs on tshirts. With SEO and marketing, you can sell t-shirt and build a profitable business in the apparel market.