@sebastian mcfox, I concur with the forum zeitgeist on green cavalry twill over heavy cotton.
However I disagree with @heldentenor who suggested that it would not be a versatile piece. In support of my case, I submit this photo of Patrik from Skoaktiebolaget which I spotted on @EFV's new website:
The Swedish text translates as "Be baller like me. Go and buy those ridiculously awesome green cavalry twill trousers immediately."