It was truly a family affair for the Melbourne Cup Fashions on the Field with two sisterss taking out the competition with outfits designed by their mother.

Jewellery designer Olivia Moor came first in the competition with a burnt orange dress with white details and a tartan structural hat, all designed by her mum Alli.

"She's so clever," the 26-year-old said of her mum.

"She works in IT so it's like a hobby."

Her sister Charlotte, 27, also came third in the competition with a pale blue design with puffy sleeves also created by her mum.

The trio actually flew to Melbourne for the competition from Auckland.

"The three of us don't actually get much time together so it's nice for us to get together and do something that we all really enjoy," Olivia said.

Olivia will now go on to compete in the Victorian final of the Myer Fashions on the Field competition, alongside the Derby Day and Oaks Day winners.

The Victorian finalist will then compete in the national final of the competition, alongside winners from Tasmania, Western Australia, South Australia, NSW and Queensland.

Melbourne Cup is usually a colourful affair, a stark difference to Derby Day's black and white theme.

Pink was one of the most common choices for women on Cup day, with numerous variations seen around the VIP sections and around the track.

Last year's winning jockey Michelle Payne was wearing a pale pink dress with long sleeves and a flower headpiece, while model Jodi Anasta went for a slightly darker pink dress with puffy selves and a purple bow ribbon in her hair.

Blue was also a popular colour, with the second placed fashions on the field entry on Tuesday wearing a blue stripped off-the-shoulder top with a navy skirt.