Billy Crystal accidentally gave away his iconic ‘When Harry Met Sally’ sweater. The 76-year-old star admitted he took “a lot” of his character’s wardrobe from the set of the 1989 romantic comedy but he has managed to lose the white woolly knitwear as he thinks he mistakenly donated it to UCLA’s drama department along with a number of other items he felt they could use for costumes. He told People magazine: “I got a lot [of clothes from set]. I’m a little bit of a clothes horse. The one I don’t have is that sweater, and I had it for years, the one from ‘Harry and Sally’ — the real one.” Asked w…