On Tuesday night at Watchung Booksellers in Montclair, N.J., Hillary Rodham Clinton held a book signing for “What Happened,” her new book recounting the events leading up to the 2016 presidential election. But there was something competing for the attention of her eager fans: Huma Abedin’s dungarees.

Ms. Abedin, the vice chairwoman of Hillary Clinton’s 2016 campaign, wore Alice & Olivia pre-fall 2016 floral embroidered flare jeans to the event. Since she tends to be photographed on the streets of Manhattan in pantsuits or patterned dresses, opting for these the day after her soon-to-be ex-husband, Anthony D. Weiner, was sentenced to 21 months in federal prison for sexting with a 15-year-old girl, was an intriguing choice.

Ms. Abedin has a long relationship with fashion. She has been spotted with Anna Wintour all over New York City this year. She attended the Met Ball twice and was shot for Vogue multiple times, wearing designers like Oscar de la Renta (her wedding gown) and Ralph Lauren. When she stood by Mr. Weiner during his 2013 New York City mayoral campaign as he acknowledged that his pattern of texting sexual images to women had continued, she wore a subdued outfit with a black cardigan sweater and her hair back in a bun.