The glamorous Commons Leader, 55, opted for an eye-catching leather number with metal stud detail and and eyelet collar - which some felt might be better suited to a 'Bananarama gig'.
In dramatic scenes at Westminster on Tuesday, the Government bowed to pressure to publish the 'final and full' legal advice to Cabinet on the Brexit deal after MPs voted that its failure to do so amounted to contempt of Parliament.
Yet many were baffled by the Tory MP's choice of attire, with one viewer tweeting: 'I don't want to trivialise Brexit but is Andrea Leadsome wearing a shocking pink leather jacket?'
'Is she off to a Bananarama gig?' Andrea Leadsom's headache-inducing hot pink jacket which she wore during last night's Brexit votes, has won comparisons to a 'shower curtain'
A second wrote: 'Given the monumental events unfolding in Parliament, there is one question that needs answering above all. Is Andrea Leadsom wearing a pink leather jacket?'
Others compared the jacket to a 'shower curtain', the Pink Ladies of Grease, and pink-obsessed Professor Umbridge in JK Rowling's Harry Potter series.
The ensemble, which saw the politician trending on Twitter last night, has even earned her the nickname 'Andrea Leathersome'.
One even said the jacket alone was reason enough for holding the Government in contempt on 'sartorial grounds'.
There is no strict dress code in the House of Commons, but as a guideline MPs are advised to wear 'businesslike attire'.
Last year, speaker John Bercow ruled that male politicians could speak in the Commons without wearing a tie.
Going viral: The garment, which saw the politician trending on Twitter on Tuesday night, has earned her the nickname 'Andrea Leathersome' and won comparisons to the Pink Ladies of Grease (pictured)
Andrea Leadsome in the House of Commons last night. The glamorous Commons Leader, 55, opted for an eye-catching leather number with metal stud detail and and eyelet collar for - which some felt might be better suited to a 'Bananarama gig'
Last night marked the first time in modern history that any Government has been found in contempt, and means the highly sensitive advice provided by Attorney General Geoffrey Cox will be published, in contravention of long-standing practice.
The vote came shortly before Theresa May kicked off a five-day debate ahead of the December 11 'meaningful vote' with a speech lasting more than an hour in which she told MPs she had delivered 'the very best deal for the British people' and backed it 'with my whole heart'.
Before the Prime Minister appeared at the despatch box, her Government had gone down to defeat for the third time in an hour.
MPs backed a move that could put Parliament in the driving seat if the Brexit deal is rejected on December 11 by giving the Commons the power to amend a motion that Mrs May would be required to make within the following 21 days to set out the Government's next steps.
The Government lost three votes in a day, the first time that has happened since 1996 – an ominous date for the Tory Party which went on to face catastrophic electoral defeat the following year. The first two were on the Brexit legal advice given to Cabinet by Attorney General Geoffrey Cox.
They were damaging, but not disastrous. The third, which is potentially much more significant, was on an amendment, proposed by leading Remainer Tory rebel Dominic Grieve, setting out what could happen if Theresa May's deal is voted down next week. It could, in theory, give MPs vast leverage over the next steps on Brexit.
Last month the Commons demanded the full legal advice be published. Ministers refused. Yesterday MPs voted to declare this decision a contempt of Parliament – a serious form of legal admonishment.
To avoid the prospect of ministers being suspended by the House, the Government rolled over and agreed to release the document today. No 10 fought tooth and nail to resist publishing, warning to do so would be 'against the national interest' and breach historic conventions. To placate MPs, Mr Cox made a statement to Parliament describing what it said and published a summary.
Much of the document will be familiar, but it will make plain the gravity of Mr Cox's warnings about the UK being trapped in the Northern Ireland backstop, potentially hardening opposition to the deal among rebel Tory MPs.
Following an earlier row this summer, Mr Grieve won a concession that if the deal falls, the Government will have to come back to the Commons within three weeks to set out what course it will then take.
As a result of yesterday's vote, MPs will now be able to propose what alternative course of action the Government should take by making amendments to the motion and voting on them.
Almost inevitably, the likely proposals will include the UK staying in a permanent customs union, or membership of the single market, or both – or a second referendum.
For its supporters, this makes 'no deal' impossible as the Commons – which is overwhelmingly opposed to crashing out – would immediately make clear its disapproval. Some hardline Brexiteers deny this, arguing that any amendment would not be legally binding on the Prime Minister. In theory this is true, but any such vote would heap huge political pressure on the Government to comply.
With nearly 100 MPs publicly expressing their doubts about the deal, its chances of passing on Tuesday already appeared slim. Losing a string of votes exposes just how weak Mrs May's grip on a fractious and volatile Parliament has become. With this in mind, the Grieve amendment could be hugely significant.
If it is seen to reduce the chances of a no-deal Brexit, could it yet convince hardline Eurosceptic rebels they should back Mrs May's deal?
Or will they press on, with the danger that the future of Brexit falls into the hands of a Remain-dominated Parliament which is flexing its muscles more every day and could yet find a way to sink Brexit altogether?
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