What to wear to Balaton Sound: Zamárdi sits at 29°C (84°F) by day and 18°C (64°F) at night in July, on beach, with a moderate chance of rain. That means a light base with one warm layer you can carry, flat sandals you can rinse, with trainers for the night stages, and a bag small enough for the gate rules. The crowd leans beach, rave and y2k, so anything that survives the day reads as right.
Women's outfits at Balaton Sound have to clear the same three hurdles as everyone else's. 29°C (84°F) by day, 18°C (64°F) at night, beach underfoot, with more options for solving them.
The dominant aesthetics at Balaton Sound are beachwear, rave wear, Y2K revival 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 4 days of beach without you having to protect it.
What people actually wear: one good layer over a light base, because the temperature halves after sunset; the same jacket every day, because it lives in the tent and does everything; something identifiable, a colour, a hat, a flag, so your group can find you in a crowd of that size.