Temper your envy of the fabulous going to private parties at exclusive clubs, because this tale of a coat gone missing, seemingly by the hands of a certain Hollywood starlet, boils down to one fact: Meatpacking District lounge 1 Oak has a "common bin" for jackets. Columbia student Masha Markova tells the Post how her precious mink coat was lost during a party "for a friend of jet-setting playboy Stavros Niarchos.":...at one point, she was......