Custom Ink became part of Washington’s digital start-up narrative by creating customized T-shirts that celebrate group bonds. In two decades, co-founder Marc Katz built a nearly $500 million business ...

Look at the tags sewn in T-shirts made by the startup Known Supply and you’ll find something unexpected—a woman’s signature. Names like Lamunu Kevin, Paolo Perales, and Thangamani, a seamstress from ...