Whittaker has been shown wearing teal cropped culottes with yellow braces, as well as a striped jumper and long trench coat.
Whittaker is the first woman to land the role.
Until Christmas (or, more likely, autumn 2018), we won't really know who the Thirteenth Doctor is.
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She said: "It's more than an honour to play the Doctor". As you can see below, she's got an overcoat, blue trousers, suspenders, and a rainbow stripe on her shirt.
I honestly can't stop staring at the photo: She looks like she's about to step out of whatever magical hilltop she's on and into my office, hopefully to become my new best friend.
Whittaker is the first female to play The Doctor in the long-running BBC series. The suspenders could be an homage to Eleven's (Matt Smith) outfit, while the striped sweater might be a wink at Tom Baker's striped scarf.
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"Definitely dig the outfit for the new Doctor, in particular the pinstripes", tweeted Ken Widdoes of British Columbia.
It's not gone unnoticed by fans with one saying it "has great elements from previous Doctors".
She will be joined in the cast by Bradley Walsh, Tosin Cole, Mandip Gill and Sharon D Clarke.
What do you think of the new look?