In embarking on an expedition—be it venturing on a safari or exploring an urban jungle—the right clothes and accessories will enhance the experience. As sportswear becomes more and more the attire of choice for most occasions, designers are taking the liberty of reinventing the essentials, although never sacrificing functionality. Whether you are trekking up the Dolomites or down Madison Avenue, the following items—from a dashing safari hat to a rechargeable self-warming jacket—are sure to elev…