Leading the High Street charge to the Duchess of Cambridge's wardrobe is Hobbs, a mid-range label that has taken her through everything from glamorous evening events to international tours.
So enamoured is Kate of the brand, even Zara, of which she was once a die-hard fan, has had to make way for it, although another budget favourite, L.K Bennett, also remains a favourite.
"The Duchess of Cambridge likes to play it quite safe when it comes to her wardrobe, pre and post-baby, and Hobbs is the perfect brand for her," explains fashion pundit Simon Glazin.
"Not only is it uber British, with everything designed in-house in London, it also dovetails with royal fashion protocol: not too revealing, neutral colours, and affordable."
Kate wearing a Hobbs Dalmatian coat in March 2013 and then again earlier this year. Photos / Getty Images
The Duchess wore a brown shirt dress from Hobbs to visit foster carers in North London in January and a delicate polka dot velvet top by the brand for a Place2Be reception at Kensington Palace in November.
On that occasion, she deployed one of her favourite styling tricks and combined the budget top with a glamorous silk skirt by Jenny Packham for maximum effect.
But while she championed Hobbs on several occasions during her second pregnancy, it is by no means the only high street staple in Kate's wardrobe.
Check out all of her looks during her second pregnancy here:
Image 1 of 29: The Duke and Duchess attend the ceremonial welcome for Singapore's President Tony Tan Keng Yam at the Royal Garden Hotel on October 21, 2014 in London, England. Photo / Getty Images
The brunette royal is also a huge fan of a small Anglo-French label called Séraphine, which has grown from a small shop in 2002 to the A-list favourite it is today.
The Duchess is the brand's most famous fan, having repeatedly chosen the label during both her pregnancies.
Along with a £195 (NZ$379) coat worn in January and a £95 (NZ$185) blue and green floral dress sported to visit the Potteries in February, she also opted for the brand when making her début in New York.
On that occasion, it was the glamorous £225 (NZ$438) plum boucle Marina coat that was chosen - and true to form, the design has since sold out repeatedly.
Séraphine is the brainchild of French expat Cecile Reinaud, who launched the brand in 2002 from a small shop on High Street Kensington, and is no doubt thrilled with the royal endorsement.
Kate wearing a Seraphine coat in January and with her husband William in New York in December. Photos / Getty Images
In March, on a visit to ITV drama Downton Abbey, Kate wore a chic cream coat from high street maternity label, JoJo Maman Bébé.
She has also sported a shirt dress from Jaeger and £99 (NZ$192) print dress by Alice Temperley during her pregnancy.
Thanks to the much-marked Kate effect, everything she has worn has swiftly sold out.
"One of the reasons for her enduring sartorial popularity is the accessibility of her wardrobe," explains Glazin.
"It's very real. Very practical. People can relate to her through her wardrobe, which is a clever move from her and her people.
Photos: Kate's baby bump the first time around:
Image 1 of 10: FILE - This is a Thursday, Dec. 6, 2012 file photo of Britain's Prince William stand next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London. With Pr
"Nothing is out of reach, and she does wear a lot from the British High Street, which is great to see. It allows people to copy her head-to-toe. People want her hair, her make-up and now her wardrobe.
"People want someone to look up to when it comes to the royals. She is the new generation.
"She, more than any other royal, has made fashion achievable for the public. Diana had an amazing wardrobe but she wore a lot of made-to-measure pieces.
"She's quite safe with her wardrobe, which makes it even more accessible."
