If you’re so over tight jeans, welcome to the club. Apparently, East Coast rich moms are, too. We’ve spotted these loose, breezy pants all over the Hamptons, from morning errand runs to Saturday mimosas. More staple than trend, these 11 pants styles dominate the coast every summer. With flowy silhouettes, linen-like materials and billowy wide legs, our top picks are as comfy as they are chic. They’re proof that there’s no excuse for sloppy sweat…