Kate's Alexander McQueen coat was the poll's clear winner, taking 25 per cent of the vote.
Repreenting the British designer who created her iconic wedding dress, Kate made her last public appearance in the large collared coat.
HELLO! Online readers chose Kate's coat and matching pink hat by couture milliner, Jane Corbett, as their favourite maternity look, closely followed the the Jenny Packham dress she chose for the Queen's coronation service at Westminster Abbey.
With Prince William
by her side, Kate stepped out wearing a bespoke silk shantung coat and dress by the British designer, which took 15 per cent
In third place was the light blue Emilia Wickstead dress that she wore to the National Portrait Gallery in April.
Kate welcomed the warm April weather by choosing a sleeveless dress and accesorised with grey suede Malone heels by Rupert Sanderson.
For her last solo engagement before becoming a mum, Kate chose an elegant monochrome leopard print coat from high street favourite Hobbs, topping her brunette locks with a black fascinator to create the look that won nine per cent of the vote.
Another of Kate's high street triumphs was the Topshop dress that she wore to the Warner Bros Studios with Prince William and Prince Harry in April 2013.
The spotted cream and black dress polka dot dress, which ranked fifth in the poll, swiftly sold out after the Duchess was photographed wearing it. With seven per cent of the vote was the peach Tara Jarmon coat that Kate wore for her visit to a children's hospice in East Anglia.
On her second wedding anniversary, on 29 April 2013, Kate visited Naomi House Hospice, wearing the £380 cotton twill coat.
For the Queen's annual garden party on 23 May, Kate wore a lemon outfit that came in at seventh place in HELLO! Online's poll. The yellow coat was also by London-based designer, Emilia Wickstead.
The outfit that Kate wore when she attended the annual Scouts parade at Windsor Castle on 21 April took eighth position in the poll. The Duchess chose a bright mint coat by Mulberry, which she teamed with pink L.K.Bennett heels and a Whiteley hat for the event where she mingled with Bear Grylls and a host of young Scouts.
Emilia Wickstead, who is one of Kate's favourite designers, is also popular with HELLO! Online readers. The designer's teal coat swung four per cent of the vote. Kate wore the coat when she accompanied Prince William to visit the Irish Guards on St Patricks Day.
Kate brightened up the dreary March day in the same outfit she had worn to the same event one year earlier.
Taking tenth place was the MaxMara
number Kate wore in February to clearly show off her growing baby bump.
The monochrome wrap dress was reportedly bought by the Duchess from the Matches website.
1. Alexander McQueen coat
2. Jenny Packham dress
3. Emilia Wickstead dress
4. Hobbs leopard print dress
5. Spotted Topshop dress
6. Tara Jarmon coat
7. Yellow Emilia Wickstead coat
8. Mint green Mulberry coat
9. Teal Emilia Wickstead coat
10. MaxMara dress