This as-told-to essay is based on a conversation with Ari Simpson, a 39-year-old entrepreneur from South Carolina, about her T-shirt side hustle. It has been edited for length and clarity.

Introduction T-shirt printing has become one of the most profitable and accessible businesses in the custom apparel industry. Whether you’re a creative entrepreneur looking to start a brand, a ...

The rapper formerly known as Kanye West directed viewers to his website, where the homepage was selling a T-shirt with a ...