The Duchess was pictured back in February at an Air Cadets event wearing a red version of the jacket, which she also matched with black jeans and black boots.
On 10 October, Kate made first public appearance since announcing her third pregnancy.
The Duchess was attractive in a blue double-breasted Philosophy Di Lorenzo Serafini blazer, paired with a pair of black trousers, black suede booties with chunky heels and Kiki McDonough laurel leaf earrings.
A Kensington Palace spokesperson said the 35-year-old expectant mum is "better but she's still suffering".
Like during her previous pregnancies Kate has been hit by Hyperemesis Gravidarum, a severe form of morning sickness. "She is making decisions day to day but is keen to do as much as she can".
Apprentices from all over the United Kingdom were honoured at West Ham's football stadium - the former Olympic stadium in London. Kate accompanied Princes William and Harry to the Coach Core graduation ceremony in London. Five years ago, the royal trio set up the Coach Core program on the eve of the 2012 London Games. Great news for fans of the royal family, who are waiting for the little brother or the little sister of George and Charlotte with the greatest impatience.
They royals will take to the London Stadium's pitch-side stage to congratulate young people from London, Glasgow, Wales and Essex on completing the Coach Core scheme.
Coach Core says it has seen excellent results from the programme, with 98 per cent of its graduates now being in full-time employment or education, and 80 per cent retain strong ties with their employers and continuing to engage in community sport.