Would you wear a $38 T-shirt that displays your COVID-19 vaccine card? Andrew Wyatt, the CEO of the fashion-tech company Cala, is betting the answer is yes. On its face, the T-shirt design may seem a little silly, or maybe even dystopian. But as vaccine mandates become more common and as municipalities like New York begin requiring people to show proof of vaccination before going to gyms, restaurants, and indoor performances, is it really that ridiculous?