What to wear to Green Man Festival: Crickhowell sits at 19°C (66°F) by day and 10°C (50°F) at night in August, on mountain, with a high chance of rain. That means a light base with one warm layer you can carry, waterproof boots, and a bag small enough for the gate rules. The crowd leans folk, cottagecore and boho, so anything that survives the day reads as right.
Women's outfits at Green Man Festival have to clear the same three hurdles as everyone else's. 19°C (66°F) by day, 10°C (50°F) at night, mountain underfoot, with more options for solving them.
The dominant aesthetics at Green Man Festival are folk, cottagecore, boho and camp-practical. 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 mountain without you having to protect it.
What people actually wear: one good layer over a light base, because the temperature halves after sunset; wellies or waterproof boots on almost everyone by day two; the same jacket every day, because it lives in the tent and does everything.