actor Steve Martin is auctioning off one of his trademark white three-piece suits for charity.The 74-year-old has starred in films including The Pink Panther, Cheaper By The Dozen, Father of the Bride and Parenthood, and is donating iconic memorabilia from throughout his lengthy Hollywood career.The charity sale will take place in Beverly Hills next month, hosted by Julien’s Auctions, a world record-breaking auction house well known for collaborating with celebrities.Proceeds from the auction