The controversial new spring racing fashion trend trackside at Flemington Racecourse for Derby Day

As the clock struck 9:30 on Saturday morning, Melbourne’s Flemington Racecourse was flooded with guests dressed to the nines for one of the Spring Carnival’s most star-studded events: Match day.

Characterized by the famous black and white dress code, the nine-race program saw stylish Aussies don their best – and most daring – monochrome attire for the iconic star-studded day, the official start of ‘Cup Week’.

Despite many today turning it up in a sensational display of eye-catching figure-hugging numbers, sky-high fashion items and OTT statement sleeves, the sartorial standard this season has been noticeably less modest and controversially casual.

Celebrities continue to seriously test the ceremonial dress code with sheer panels, thigh-high slits, midriff cutouts, plunging necklines and cheeky off-the-shoulder numbers – most notably Lana Wilkinson, Bambi Northwood-Blyth, Montana Cox and Tess Shanahan.

Model Tess Shanahan also showed off some skin with a huge cutout in her figure-hugging number

Stylist to the stars Lana Wilkinson wasn’t afraid to test the traditional boundaries of the dress code as she showed off her legs under a sheer skirt topped with an off-the-shoulder piece that showed off her skin. Model Tess Shanahan (right) also showed off some skin with a huge cutout in her figure-hugging number

Bambi Northwood-Blyth showed off her enviable physique in a plunging jumpsuit

It was a risk given the more traditional and modest appearance of previous years

Bambi Northwood-Blyth showed off her enviable physique in a plunging jumpsuit – a daring choice considering the more traditional and modest looks of previous years

Montana Cox arrived in a sassy mini dress with a sleek, off-the-shoulder neckline that showed off her curves;  It's unlikely the playful look saw the inside of the Birdcage before a more daring clothing trend emerged

Montana Cox arrived in a sassy mini dress with a sleek, off-the-shoulder neckline that showed off her curves; It’s unlikely the playful look saw the inside of the Birdcage before a more daring clothing trend emerged

Designer Rebecca Vallance told Ny Breaking Australia it’s fine to go shorter on Derby Day, but suggested something more modest for Melbourne Cup Day, despite bold looks slowly becoming the ‘norm’.

“Derby Day is the first day of the Spring Racing Carnival and the dress code is black and white only – it’s a chance to have fun with your outfit,” she said.

The black and white dress code dates back to the 1960s, when a huge clothing prize was awarded to the woman who wore the best monochrome ensemble at the Melbourne Cup, which was sponsored by whiskey brand Jamas Buchanan and Co; the brand has a black and white logo.

It was soon adopted by other events as an ‘unofficial’ dress code and as Derby Day is the most ‘bespoke’ day of the carnival, black and white suited the occasion perfectly.

The $2 million Group 1 Penfolds Victoria Derby was first held in 1855 and brings together Australia’s most talented young stayers.

Take a look at the other notable trends that emerged from Derby Day 2023…

OTT SLEEVE

Lorinska Merrington wasn't shy when it came to a statement cover when she arrived at Flemington Racecourse

Rachel Watts wore a striking statement off-the-shoulder sleeve as she posed in the Birdcage

Lorinska Merrington (left) and Rachel Watts (right) weren’t shy when it came to a statement cover as they arrived at Flemington Racecourse

HUGE ARCHES

Model and former Fashions on the Field winner wore a huge white bow embellishment, taking the trend to new heights

Jessie Murphy rocked a gorgeous oversized white bow in her tumbling mid-length dress

Model and former winner of Fashions on the Field wore a huge white bow embellishment, taking the trend to new heights. Jessie Murphy rocked a gorgeous oversized white bow in her tumbling mid-length dress

SEXY STRAPLESS FROCKS

Olivia Molly Rogers stunned in a plummeting strapless stress

Kate Waterhouse wore the trend a little differently with a curved neckline and a playful skirt with fringes

Olivia Molly Rogers stuns in a plunging strapless stress while Kate Waterhouse wore the trend a little differently with a curved neckline and a playful fringed skirt

Tiktok's Elle Ray opted for a form-fitting corset with sheer panels and a plunging back as she arrived at the star-studded Birdcage

Strapless pieces and low backs were a rising trend on the track, with many pushing the boundaries of traditional racing fashion with bolder, sexier looks

Tiktok’s Elle Ray opted for a form-fitting corset with sheer panels and a plunging back as she arrived at the star-studded Birdcage

BRIDAL CHIC

Erin Holland wore a hooded outfit reminiscent of a modern bride

Kate Peck also created a Vegas bridal vibe in a cute white dress with loose sleeves and a chiffon bow

Erin Holland wore a hooded outfit reminiscent of a modern bride, while Kate Peck also exuded cool Vegas girl bridal vibes in a cute white gown with loose sleeves and a chiffon bow

Rozalia Russian also exuded a super cool runaway bride as she walked through the Birdcage

Rozalia Russian also exuded a super cool runaway bride as she walked through the Birdcage