Kate Middleton's personal style is top tier. Kate's stunning style transformation continues to inspire many. One look at her closet, and it's clear that Jackie Kennedy and Princess Diana are two of her biggest influences. The Duchess of Cambridge infuses a lot of '60s trends into her look which call back to the former first lady of the United States, per House Beautiful. 

Some of Kate's best fashion moments have been shaped by the "Jackie Effect." The jade tailored coat and matching pillbox hat — Kennedy's personal favorite — that she wore to the 2022 St. Patrick's Day Parade (pictured above), definitely has Kennedy influences. On March 22, 2022, the pillbox hat made another appearance at the annual Commonwealth Day Service held at Westminster Abbey, reports Daily Mail. Kate went for a monochrome look and paired a royal blue A-line coat dress with a matching hat. Princess Diana was also a fan of the distinct accessory and wore a variation of the style on multiple occasions, per Newsweek.