And speaking of backstage thoughtfulness…backstage at today’s Rodarte show, sturdy Aveda water bottles sat strewn about on the jumble of make-up tables. For the second season in a row, the original eco-minded beauty brand has been doling out re-usable bottles to every model, hairstylist, and make-up guru to remind them to hydrate themselves—and eliminate excess waste. Meanwhile the duo’s fall gowns featured incalculable layers of fluid chiffon, the best of which came covered with watery, tie-dye patterns…