Meet 25-year-old David Casavant, the owner of one of the largest collections of Helmut Lang in the world, and supplier of rare designs to some of the world's most fashionable celebrities. Casavant is on Kanye and Rihanna's speed dial, on hand to lend out pieces from his vast collection, acquired through auction, and eBay, to keep the stars looking sharp and unique. 

Watch above as Casavant explains his passion for the designs and his desire to 'keep them alive' by being worn. He makes his living from renting out the clothes for photoshoots, music videos and red carpet appearances. Now that is clever collecting.