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ELIZABETH AND JAMES cardigan in caramel $395, MARYSIA scalloped bikini bottom $143 and ERIC JAVITS giant floppy sun hat $450 at NEIMAN MARCUS; JACQUES MARIE MAGE sunglasses $928 at VITRA EYEWEAR HAWAII, TIDEPOOL LOVE ‘Double Sharky’ ring $60 at tidepoolhawaii.com

From retro-inspired two-pieces to thoroughly modern maillots, these poolside styles can certainly take the heat.