Looking at your Avatar, I would have thought that you wouldn't need much.

Minimum requirements will be pertex body cover to be carried ie Montane Fetherlites (top and trousers). However, if conditions are deemed appropriate, the organisers (as with any FRA event) may insist upon full waterproof body cover (including hat and gloves). It's always worth having both types with you and you can make the decision when you arrive.