ESC: Kate Middleton, Melania Trump

AP; Mark Wilson/Getty Images

The coat dress is to the public figure, as the denim jacket is to the It Girl.

(See: Kate Middleton's best looks as evidence.)

The typical closet may not include the seemingly fancy, cold-weather piece, but royals and first ladies have them in spades. Call it the de facto wardrobe essential for influential women. On her tour of Asia, Melania Trump wore at least three variations of the coat dress. And, we've seen the Duchess of Cambridge wear it on the job even more.  

The coat dress is warm and looks formal without requiring much outfit coordination. Just pair one with heels and you're ready to meet the Japanese prime minister…or attend your next holiday party. It's an efficient piece of clothing that is also sophisticated, but just because it seems simple, doesn't mean it's not without impact.

Although it's obvious that the first lady and duchess have a penchant for the coat dress, the women have completely different styles—and it shows…even when wearing very similar-looking pieces.

ESC: Melania Trump

AP/REX/Shutterstock

Kate Middleton, Duchess of Cambridge

Press Association via AP Images

ESC: Melania Trump

MANDEL NGAN/AFP/Getty Images

ESC: Kate Middleton, Style Story, February 2012

Samir Hussein/WireImage

ESC: Melania Trump

Mark Wilson/Getty Images

ESC: Kate Middleton

Press Association via AP Images

Melania Trump, First Lady Fashions

AP Photo/Andrew Harnik

ESC: Kate Middleton, Catherine Duchess of Cambridge

Tim Rooke/Rex/REX USA

ESC: Melania Trump

Chung Sung-Jun/Getty Images

ESC: Kate Middleton

Andrew Matthews - WPA Pool/Getty Images

Melania Trump

Anna Ferensowicz / Pacific Press

ESC: Kate Middleton

Chris Jackson/Getty Images

ESC: Melania Trump

Lintao Zhang/Pool Photo via AP

ESC: Kate Middleton, Style Story, February 2015

Karwai Tang/WireImage

ESC: Melania Trump

Vatican Pool/Getty Images

ESC: Kate Middleton

Tim Rooke/REX/Shutterstock

ESC: Melania Trump

Mark Wilson/Getty Images

ESC: Kate Middleton

Tim Rooke/REX/Shutterstock

We're calling it: It's time to invest in a coat dress. 

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