Step 1 – Find a Niche Market and Craft Your T-Shirt Image and Message In order to find a niche market for your t-shirt, you have to do some research. Start by figuring out what your customer likes and what they don’t like. For example, if you’re selling a shirt that has the words “I’m not a morning person” on it, then your target market would be people who are not morning people. You should also take into account the size of the market and how big it is. If there are only 100 people in your target market, you might want to reconsider selling that shirt because it’s not worth it and you won’t make any money off of it.