Instead of the broad shoulders and square jaw of Colin Firth there is a modestly-sized chest and pointy chin.
There is little description of him in Pride and Prejudice, so the academics used historical fashions from the 1790s, when it was written.
This version also wears a powdered wig.
"Our Mr Darcy portrayal reflects the male physique and common features at the time," says Amanda Vickery, professor of early modern history at Queen Mary University of London.
"Men sported powdered hair, had narrow jaws and muscular, defined legs were considered very attractive," she says.
Colin Firth got the nation's collective hearts racing in 1995 with his depiction of the mysterious Mr Darcy in the BBC's adaptation.
Further adaptations since have followed in the style of Firth's portrayal including  Matthew Macfadyen in the 2005 film of Pride and Prejudice.
But the academics say their muscular chests and broad shoulders would have been the sign of a labourer and not a gentleman at the time the book was written.
The fans' favourite Mr Darcy moments - when Colin Firth walked out of a lake dripping wet and Matthew Macfadyen crossed a field in the mist, both showing off their chests - would not have looked the same with the historically accurate Mr Darcy and his sloping narrow shoulders.
Some fans have not been impressed by the portrait.
Professor John Sutherland, from University College London, who led the research says they only had "scraps" of physical description of the character Fitzwilliam Darcy.
As well as looking at the fashions of the day they also looked at Austen's relationships and the men who may have inspired her characters.
"He is our most mysterious and desirable leading man of all time, says Prof Sutherland.
And he appears frequently in modern culture.
Further depictions of Mr Darcy include Matthew Rhys who played the character in the TV adaptation of the Pride and Prejudice "sequel" Death Comes to Pemberley.
He also inspired the character of Mark Darcy in Bridget Jones's Diary by Helen Fielding, also portrayed by Colin Firth in the film versions.
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The line, from Edinburgh to Tweedbank, opened last year at a cost of Â£350m and carried almost 700,000 people in its first six months.
That was 22% more than forecast for the route, which serves towns including Galashiels, Stow and Gorebridge.
The line's success is the focus of a conference being held in Newtongrange.
Allison Cosgrove, from campaign group Railfuture Scotland, organised this weekend's event.
She said: "The Borders reopening has exceeded all expectations, so naturally there's interest from other parts of the country from people wanting to share that success.
"The whole area is beginning to benefit from this project, with a hugely positive impact on local tourism.
"We'll be telling the story from the point of view of campaigners and politicians, as well as looking at the practical challenges of rebuilding the railway."
The Borders was without any connection to the rail network from 1969 until last year after the Waverly Route was axed in cuts recommended by Dr Richard Beeching in his British Railways reports in the 1960s.
A plan to reopen the line was passed in the Scottish Parliament in 2006 with work starting in November 2012 and the first passengers travelling last September.
The conference is being held at the National Mining Museum Scotland in Newtongrange, Midlothian, on Saturday.
Ms Cosgrove added: "It's appropriate that we've chosen a venue on the reopened line.
"It's one of a collection of small towns in a forgotten area of Scotland which have been regenerated and reinvigorated.
"Railways are now being talked about in Scotland, thanks to the success of the longest rail reopening for a hundred years."
Academics have revealed what they claim is the first "historically accurate" portrait of Jane Austen's Mr Darcy - and he's a world away from the romantic hero of films and TV.
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Small towns on the Borders railway route have been "regenerated and reinvigorated" by the opening of the line, campaigners have said.