This isn't to say the look is head-to-toe highlighter pen.

Neons, stylists say, should be deployed with some artfulness - perhaps as accessories only.

''Neon's cool and all, but no one will wear it full-on,'' local designer, Westfield stylist and fashionista Janette Lenk said. ''It's more about hints of neon.''

Reigning Canberra Face of Racing Brittney McGlone is also tipping neons as a hot trend with the caveat they should be for accessories only, and can be so riveting they might draw attention away from the face.

McGlone added that overall polish was the key.

''It's all about the [whole] package, sleek hair, perfect make-up and class all the way.''

Lenk, a former Fashions on the Field judge, had some Cup day style advice to dispense: ''It's the little things that really complete the outfit.''

She recommended bright colours, clashing contrasts and floral prints for the spring carnival as well as flowers worn in the hair.

Those hoping to compete in the classic racewear contests were reminded that a fancy topper - something great worn on the head - was an absolute must-have. Today in Canberra, Thoroughbred Park invites locals to ''release the inner show pony'' for the race that stops the nation.

Canberra style legend Angela Menz, who has won a Fashions on the Field national final, said racegoers ought to embrace the celebratory atmosphere and dress accordingly.

''For me, that means lots of colours. Other race days are a bit more rigid; this is the ultimate party day.''

She plans to don skull motifs, pompoms and flowers in an ''accessory overload'' that will nod to Mexico's Day of the Dead.

Menz, a trained fashion designer, has made the ensemble herself.

Beside neons, she said peplums would be a Cup Day trend. Peplums, a current season trend, are loved for their flattering shape, which nips in at the waist and kicks out over the stomach, in this way disguising a multitude of sins.

Meanwhile, the high-spirited are reminded to not let their partying spin out of control.

ACT Policing has warned police will to keep a stern eye on Thoroughbred Park and Civic to ensure punters are well behaved.

Random breath testing is to be conducted city-wide. Those planning to party were asked to be responsible, plan carefully, and to use public transport or grab a lift.