Let's start with a Markle specialty: movie premieres. As an actress, she has plenty of experience dressing for the red carpet.
It's a pretty simple look — little black dress with strappy heels. Cute, but nothing groundbreaking.
As a duchess, Middleton attends plenty of premieres herself. Here she is a year earlier, at the premiere of "War Horse."
In general, Middleton's approach is one of simple elegance, as seen in the gorgeous sheer gown she wore to the premiere of the Bond film "Spectre."
In addition to premieres, both Markle and Middleton make frequent public appearances to draw attention to issues they believe to be important.
She works to be on the cutting edge of fashion — sometimes to her detriment, as in the case of this bizarre shorts-suit combo.
However, being a trendsetter can require taking risks. Searches for "vegan leather trousers" jumped 67% after Markle name-dropped the article of clothing in an interview.
Source: The Telegraph
Middleton is far less likely to follow trends when making appearances at events for charitable organizations or other fund-raising functions.
Even when Middleton wears something that's a bit more fun, it's not trendy. This polka-dotted dress is pretty much as bold as she will go when it comes to a charity function — almost quirky, but mostly timeless.
The one place she is willing to let loose, both in fashion and more generally, is when it comes to athletics.
While watching sports, she has a chance to wear more casual outfits, like this sleeveless button-down.
Twitter trolls slammed Markle for wearing casual jeans during her first-ever public appearance with Prince Harry, at the 2017 Invictus Games.
Even in their sportier outfits, Markle is more attuned to trends, while Middleton goes for classics.
It is somewhat unfair to compare Kate's fashion decisions to Markle's style before she became associated with the royal family.
Middleton met and began dating Prince William while the pair attended the University of St. Andrews. As a result, she's been in the public eye as the prince's significant other for most of her adult life.
A more direct comparison is how Markle's post-engagement fashion has lined up with Middleton's choices over the last decade. In her first public appearance as Prince Harry's fiancée, Markle wore a coat from Line, a little-known Canadian brand — helping to crash the brand's website.
Source: Business Insider