"She thinks she is sitting on the French Riviera sipping champagne," read one complaint on Twitter.
The first lady wore a Dolce & Gabbana dress with navy trim and a matching hat to visit Buckingham Palace.
Trump notoriously wore a fuchsia version of the designer blouse to the second presidential debate in 2016, days after her husband's "grab them by the p***y" quote was leaked.
The first lady was hand-in-hand with her husband, President Trump, when she stepped out in the vibrant designer coat.
Kamala Harris and Elizabeth Warren were among the few female lawmakers who didn't wear white to President Trump's 2019 State of the Union address.
Eagled-eyed social media users were quick to wonder as to why the first lady was only wearing one glove.
Female lawmakers attended President Trump's State of the Union address wearing "suffragist-white" to symbolize women's rights.