What to wear to Ultra Europe: Split sits at 31°C (88°F) by day and 22°C (72°F) at night in July, on city streets, with a low chance of rain. That means loose natural fabrics and real sun protection, cushioned trainers or a low boot, and a bag small enough for the gate rules. The crowd leans rave, edm and beach, so anything that survives the day reads as right.
Women's outfits at Ultra Europe have to clear the same three hurdles as everyone else's. 31°C (88°F) by day, 22°C (72°F) at night, city streets underfoot, with more options for solving them.
The dominant aesthetics at Ultra Europe are rave wear, EDM festival wear, beachwear and high glam. That is the visual language of the site, the stages, the merch, the crowd photos, and outfits that speak it look intentional rather than borrowed.
There is no enforced dress code. What the crowd rewards is a look that survives 3 days of city streets without you having to protect it.
What people actually wear: as little fabric as the venue allows, in natural fibres, with a bag small enough to forget about; something identifiable, a colour, a hat, a flag, so your group can find you in a crowd of that size.