After famously inventing the wrap dress, Diane von Furstenberg sold off her company and felt like a “has-been.” But, she reveals in a new interview, she spotted a fashion trend that gave her the courage to start her empire up again. “I didn’t know when I was young what I wanted to do, but I knew the woman I wanted to become,” the designer tells Alina Cho on CNN’s “Fashion: Backstage Pass,” airing Saturday. She recalls that she came up with the wrap dress in her late 20s after moving to New York and wanting to create, “very, very, very practical little dresses that look like nothing . . . you could put it in your handbag . . . it was so different from anything.” By 1976 she’d sold a million of them. She later sold her company and moved to Europe, but felt “sad when I came back and I realized that my brand was so much a part of who I was, and I had lost it.” In the ’90s she then began noticing young women “wearing the old dresses. The vintage. You see, I was feeling so much of a ‘has been’ and then, all of a sudden, I saw that the very hip girls — the actresses and the models — were buying the old dresses in vintage shops. So that gave me courage.”