T-Shirts can be a problem. As anyone who has ever had to order a bunch of shirts for some charity function knows predicting the sizes of people is hard. A few smalls, some mediums, a lot of larges, some XL and XXL, with a few XXXL for good measure. Or worse, just got with a lot of XL's since "that'll fix everyone".I've known many techies over the years who wear a size 50 suit (if not larger), a…