When Scottish student Caitlin McNeill, 21, posted a photo of a blue and black dress that looked white and gold from some angles, it sparked an internet debate so furious even A-listers couldn't resist getting involved. Now another  internet dress furore has begun, this time over the colour of Scottish National Party leader Nicola Sturgeon's dress. The SNP stalwart, 44, wore the opinion-splitting ensemble, which has variously been described as blue, grey and green, for her appearance on the BBC contenders' debate last night. Scroll down for video . Was it grey, green or ice blue? Nicola Sturgeon's dress divided opinion on Twitter during last night's debate . Going for grey: A viewer takes to Twitter to insist the dress he saw was grey . Baffling: Another viewer says while he initially thought the dress was grey, he has concluded it was green . But while her policies - and the coalition invitation issued to Labour leader Ed Miliband - made headlines, on Twitter, it was all about the dress. While most plumped for grey, with some noting that she and Mr Miliband appeared intent on co-ordinating their look, others insisted that the colour was green. 'Wait, Nicola Sturgeon's dress in that debate was green?' wrote a viewer named Andy Dowling. 'Looked grey on my telly.' Another, using the name Suze, complained: 'Her dress was teal. Papers have changed the colour, giving a less flattering skin tone (making her look harsh)'. Sports journalist Patrick Kidd also chipped in, writing: 'Let's focus on the most important issue from the debate. Nicola Sturgeon's dress was clearly grey, not blue.' Grey: Many viewers watching the debate thought Miss Sturgeon's dress was grey . Different colour: In a photo taken as she left the studio, Miss Sturgeon's dress appeared to be blue . Going for green: Under the studio lights, Miss Sturgeon's get-up seemed to be green . Back to grey: In this photo of Miss Sturgeon with the Green's Natalie Bennett, it once again looks grey . Not everyone was interested in the change in colour, which is likely to have been the result of harsh studio lights producing a different hue to the one seen in natural daylight, however. One irate viewer tweeted that they were concerned that the frock frenzy might overshadow the SNP's manifesto launch today. Another, named Milly, said the focus on the dress missed the point. 'Are you telling me all people are worried about is Nicola Sturgeon's dress?' she wrote. 'It was a political debate dammit!' The furore over Miss Sturgeon's dress isn't the first time the SNP leader has made headlines for her sartorial nous. Not impressed: One viewer declared her concerns about the debate overshadowing the SNP manifesto . Be serious! Another said viewers debating the colour of the dress were missing the point of the evening . The original: This was the frock that sparked the original #thedress debate . Slick: Miss Sturgeon has been lauded for her dress sense and is seen here at the Scottish Leaders' Debate . Stylish: Miss Sturgeon claims to be uninterested in clothes but admits to a passion for Kurt Geiger shoes . Although the SNP leader claims to be uninterested in splashing out on expensive clothes and bags in the past, she has admitted to a weakness for shoes, albeit Kurt Geiger rather than Jimmy Choo. Those were in evidence at the main leader's debate two weeks ago, when she wore a pair of skyscraper courts by the label with a chic coral two-piece by Glaswegian label, Totty Rocks. Other fashion hits include the glamorous green floral dress and fitted jacket combination she wore to kickstart the SNP's election campaign and the pillar-box red dress worn to address supporters on the eve of last September's Scottish referendum.
Viewers took to Twitter to argue over the colour of Nicola Sturgeon's dress .
Miss Sturgeon's dress appeared blue in some lights and green in others .
Others thought she was wearing a grey dress during last night's debate .
The first #thedress debate was sparked by Scottish student Caitlin McNeill .