Kellan Lutz recently took a break from being a vampire in Twilight and an Expendable in The Expendables 3 to stroll around Coachella. The 29-year-old was all smiles as he rocked a near-perfect festival outfit and, guess what, most of it came from ASOS. As a rule dude, you should probably stick with the one hat, but other than that, it works.
A varsity-print vest will keep you cool, figuratively and physically, while the heavyweight check shirt looks just as good around your waist as it will worn when the sun drops. Flip-flops or sandals are great (but have a back-up plan in case you're not blessed with Cali-style weather), while the turned-up chinos are cool and hardwearing. Finish the whole thing off with classic Wayfarers, leather accessories and massive guns, and you're good to go.