What to wear to Sonus Festival: Novalja sits at 30°C (86°F) by day and 22°C (72°F) at night in August, on beach, with a low chance of rain. That means loose natural fabrics and real sun protection, flat sandals you can rinse, with trainers for the night stages, and a bag small enough for the gate rules. The crowd leans techno, beach and underground, so black and functional reads as insider.
Women's outfits at Sonus Festival have to clear the same three hurdles as everyone else's. 30°C (86°F) by day, 22°C (72°F) at night, beach underfoot, with more options for solving them.
The dominant aesthetics at Sonus Festival are techno black, beachwear, underground and island resort. 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.
This is a function-first crowd. Black, utility and good shoes read as insider; heavy glitter and fancy dress read as tourist. Nobody is stopping you, but you will feel it.
What people actually wear: swimwear as a base layer, a sarong or shirt over it, and shoes that can be rinsed.