What to wear to Gnaoua World Music Festival: Essaouira sits at 22°C (72°F) by day and 16°C (61°F) at night in June, on beach, with a low 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 boho, beach and hippie, so anything that survives the day reads as right.
Women's outfits at Gnaoua World Music Festival have to clear the same three hurdles as everyone else's. 22°C (72°F) by day, 16°C (61°F) at night, beach underfoot, with more options for solving them.
The dominant aesthetics at Gnaoua World Music Festival are boho, beachwear, hippie and quiet elegance. 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; something identifiable, a colour, a hat, a flag, so your group can find you in a crowd of that size.