By Paolo Sandoval Whether it’s describing the recent double-knee pants preoccupation or the longstanding Carhartt craze, workwear has become somewhat of a buzzword in the fashion sphere as of late. While some gear is up to the challenge, it seems like every label wants to get in on a piece of the action, most to various degrees of suck. Workwear needs to be tough, it needs to fit well and it should be down to get a little dirty; most brands nowadays just aren’t up for the challenge. And then there’s Filson. The Seattle-based heritage brand has supplied outdoorsmen with rugged, hardwearing gear…