What to wear to Rhythm and Vines: Gisborne sits at 24°C (75°F) by day and 14°C (57°F) at night in December, on open field, with a low chance of rain. That means a light base with one warm layer you can carry, broken-in boots or sturdy trainers, and a bag small enough for the gate rules. The crowd leans party, y2k and camping, so anything that survives the day reads as right.
Women's outfits at Rhythm and Vines have to clear the same three hurdles as everyone else's. 24°C (75°F) by day, 14°C (57°F) at night, open field underfoot, with more options for solving them.
The dominant aesthetics at Rhythm and Vines are party, Y2K revival, camp-practical and rave wear. 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 3 days of open field 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.