It has been one of the Prime Minister's only allies during the most turbulent month of her premiership: a safety blanket - or body armour - that she has donned again and again ahead of political tussles in London, Brussels and Strasbourg.
Indeed Theresa May, 62, has donned the same £825 coat - known as a 'twofer' as it's designed to look like two different pieces together - on no fewer than 16 days since the start of the month. Twelve, including today, have been in the last fortnight.
She also owns the coat in black and was seen wearing it in October last year.
But while Mrs May is known for her keen interest in fashion - she famously said she would take Vogue as her Desert Island Discs luxury - and has won praise for statement pieces like her tartan suit and leopard print pumps, the sky blue coat marks a rare style miss.
The coat, from Italian brand Herno, is still available to buy just at Mrs May's favourite boutique in Henley, Oxfordshire - just a stone's throw from her Maidenhead constituency - suggesting voters haven't been rushing to replicate the PM's style.
It is a far cry from the shopping frenzy typically sparked by the Duchesses of Cambridge and Sussex, whose outfits can sell out in minutes thanks to the power of the 'Kate effect' and the 'Meghan effect'.
Today, London: Theresa May wears her 'lucky' £825 blue coat as she leaves 10 Downing Street earlier today. The Prime Minister chaired a meeting of her cabinet amid reports of an attempted coup by colleagues over her handling of Brexit
24 March, Maidenhead: Prime Minister Theresa May donned the jacket after attending a church service near her Maidenhead constituency yesterday
22 March, Brussels: Mrs May donned the sky blue coat over a purple coat as she left the British Residence in Brussels to return to the UK last Friday
21 March, Brussels: Theresa May leaves Downing Street ahead of the EU summit in Brussels
20 March, London: Mrs May leaves Downing Street ahead of Prime Minister's Questions
18 March, London: Once again dressed in the coat, Mrs May leaves Downing Street
17 March, Maidenhead: Arriving at church near Maidenhead with husband Philip
15 March, London: Recording her video message for the people of New Zealand following the terror attack in Christchurch
The long wool blend coat, most recently seen on the Prime Minister today, is a simple shape with padded cuffs, single breasted button fastening and lapel collar.
The padded inner layering can also be removed to leave the Prime Minister with just the blue wool coat.
It also features a funnel neck, cropped sleeves, a quilted lining, a detachable neck and sleeve panels for added layering insulation.
Speaking to FEMAIL, celebrity stylist Lucas Armitage noted the Prime Minister is often spotted in the coat at 'crucial moments'.
'Light blue is often said to denote themes of trust, stability and wisdom dues to its infinity with the colour of the sky,' he said.
'This may be why Theresa grabs for this modern zip-through style at critical moments of her leadership.'
14 March, London: Theresa May leaves Downing Street for the House of Commons
13 March, London: The Prime Minister leaves No 10 in an almost identical outfit
12 March, London: Once again Mrs May leaves No 10 dressed in the same blue coat
11 March, Strasbourg: The PM sported the coat when she met Jean-Claude Juncker for last-ditch talks in a failed bid to win support for her Brexit deal in Strasbourg two weeks ago
He continued: 'For me the coat says a lot about what she currently feeling, the silhouette and style is unfussy and functional and the zip through the middle totally practical.
'It’s a style that says it’s here to do exactly what it needs to do - essentially something she hopes to mirror in her important next few days.'
He added: 'The colour for me is the critical factor it’s optimistic and hopeful whilst shows her the wearer as all the attributes we know Blue is said to evoke.'
10 March, Maidenhead: Theresa and Philip May arrive for a church service in Maidenhead
6 March, London: Carrying a folder, Theresa May leaves No 10 for Prime Minister's Questions
4 March, Salisbury: Mrs May marks with local Conservative Party MP John Glen following a visit to the city to mark one year since the nerve agent attack on ex-spy Sergei Skripal
3 March, Maidenhead: Mr and Mrs May leave a church service in Maidenhead
The Prime Minister appears to be such a fan of the collarless coat, she even has it in black.
She was seen wearing the alternate colour version as she left Downing Street in London, before heading to the House of Commons to hear the Budget from Chancellor Philip Hammond in October last year.
The coat is made by the Italian company Herno, which was founded in 1948 and first started by making raincoats to suit the humid climate around Lake Maggiore.
October 2018, London: Mrs May opted for the black version of her coat as she left Downing Street before heading to the House of Commons to hear the Budget on October 29, 2018
The Herno coat has a funnel neck, cropped sleeves, a quilted lining, a detachable neck and sleeve panels for added layering insulation