Mouths dropped in shock around the world yesterday.
Make no mistake, the decision to wear a suit with purple embellishment was no accident.
Her Ralph Lauren Collection suit featured purple lapels, with a matching purple top worn underneath, and the internet is bursting with explanations about the colour choice.
Listen: Mia discusses the US election with author Jodi Picoult. Post continues after audio.
1. Red + Blue = purple.
Many people thought it was a sign from Clinton that political loyalties aside, it was time to come and work together, as purple is the colour created from mixing Democratic blue with Republican Red.
Vanity Fair's Kenzie Bryant pointed out swing states - which ended up deciding this election - are referred to as 'purple states' during the election for this very reason.
2. It represents respect and support for women.
The colour used for International Women's Day? Yep, the very same purple.