- The Costa has been a best seller since day one. It's the airy shirt you want for the warmest days of the year. - Same silhouette you know and love, updated this season in a linen blend with incredible texture. - A little wrinkle is part of the charm, so this is a great travel shirt. - Roll up the sleeves and unbutton a few for an effortless, coastal look. - Matte mother-of-pearl buttons.