When soaking up the sun in California, it's appropriate to roll around wearing board shorts and smug grins, but on the East Coast, you must dress in line with more sophisticated activities -- like bitching about Californians. For gear from guys who've made the transition, Shipley and Halmos.
S&H was started by two original designers from Cali-cool casual menswear line Trovata, who moved East after realizing their Reverse Manifest Destiny lay in creating a modern, preppy "buttoned-up Northeast" aesthetic using several soft, ultra-wearable grades o' cotton for their habiliments. Highlights from the Spring line start with leg-clothes like the button-fly "relaxed-slim" Caspian 5 Pocket Trouser in "slightly sheeny" soft cotton, and the mo' dressy "starchy-soft" black cotton Ladoga Slant Pocket, w/ extra buttons at the waistband providing "a unique extra when tucking in your shirt", effectively dashing any hope for a quick poop. For your upper half, they've got understated, slim wool ties (tiger grey, cross-pattern), "crisp-starchy" relaxed-fit button-ups w/ reinforced double-thick side details, which come in quad stripe, navy check, thin double stripe, and vintage white, and the sheer, lightweight cotton Ionian Short Sleeve Stripe Polo w/ a rounded hem in "Geezer Black", also the withered hero of a popular 70s Oldsploitation flick.
S&H've also got cotton navy two-button slim-notched-lapel suit jackets, and a waxed-cotton four-button Thames Double Breasted Rain Coat w/ zip front pockets and ventilation under the arms for "breathable style" -- because on either coast, true sophistication boils down to not suffocating bystanders with your pit stank.