His solution is a worthy one—plaid flannels have remained reliably cool from the moment they entered the American style lexicon, on loggers and railroad workers during the Industrial Revolution, all the way through the grunge explosion of the early ’90s, as worn by Cooper’s beloved Pearl Jam. The Maestro star has a real knack for seeking out overshirts with precisely the right hardy weight, oversized cut, and rich tones to complement his…

