Oasis Festival takes place in Marrakech, Morocco, usually in September, Moroccan autumn. It is a small, 8,000-capacity festival where the crowd notices what you wear, running 3 days across desert with no camping on site.
Poolside house music in 34°C Marrakech heat. Swimwear plus a kaftan is the entire uniform, with something warmer for the desert night.
Plan around heat first: daytime highs sit near 34°C (93°F), which rules out anything heavy, tight or synthetic in the middle of the day. Rain is unlikely, which is the one thing you can plan around.
Below: the 10 outfits that work best at Oasis Festival, what the crowd actually wears, and the practical rules, bag size, footwear, night layers. That decide whether the outfit survives the weekend.