The carnival runs across four days, and it is as much a styling event as a racing one. The mistake most men make is dressing for all four the same way, because the four days genuinely are not asking for the same thing.
Derby Day: light grey, kept quiet
Derby Day is black and white, which means everyone arrives in black and a light grey suit is the quiet way to be visible. Work black or white into the outfit as a nod to the day rather than a costume. Bold patterns and checks are well within the rules, and a spring weight necktie lifts the whole thing.
The carnival gives you plenty of room for dramatic dressing later in the week. Derby Day is the one to keep simple and understated.

Melbourne Cup Day: bold colour, strong pattern
Cup Day is where the festive season in Australia really starts, and the weather has turned by then. This is the day to have some fun with it, whether you are trackside or at a corporate function. Do not be shy about dressing up for it.
For a bit of extra pizzazz, bring an accessory people can ask you about: a statement tie or bow tie, and cufflinks worth a second look.
Oaks Day: cream linen
Oaks Day goes lighter. Cream or light grey suits do well, and so does a lighter blue blazer with a soft pink shirt or a floral accessory. This is also the most reusable look of the four, because it is exactly what a beach wedding, a garden party or a summer function wants. You will get more wear out of this outfit than any other in the week.
Stakes Day: relaxed on purpose
Stakes Day closes the carnival and is traditionally the quieter one, usually treated as a family day. Dress accordingly. A check sports coat or a blazer with chinos and a tan leather shoe is enough, and turning up over dressed is its own kind of mistake.
Every THEODORE garment is cut to your own measurements. Book an appointment at the studio, at a touring fitting, or over video.