Marine Layer Clothing

Spending a year and $40,000 to figure out the formula for the perfect comfy T-shirt

When Mike Natenshon’s girlfriend accidentally threw out his favorite T-shirt—perfectly soft from years of wash and wear—he underwent a long series of experiments to replicate that worn-in comfiness right off the rack. And, while the former investment banking analyst says it took “a year and $40,000 in credit card debt to get our fabric set and the first run of shirts made,” the result is …