What to wear to Full Moon Party: Koh Phangan sits at 30°C (86°F) by day and 25°C (77°F) at night in January, on beach, with a moderate 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 beach, neon and rave, so anything that survives the day reads as right.
Women's outfits at Full Moon Party have to clear the same three hurdles as everyone else's. 30°C (86°F) by day, 25°C (77°F) at night, beach underfoot, with more options for solving them.
The short version: Neon and UV paint on a beach: bright vest, shorts, and shoes, because the sand hides broken glass.
The dominant aesthetics at Full Moon Party are beachwear, neon, rave wear and tropical. 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 1 day of beach without you having to protect it.
What people actually wear: swimwear as a base layer, a sarong or shirt over it, and shoes that can be rinsed.