Depends on the time of year, in summer we have been wearing disposable paper suits that are used for asbestos removal ( they are not really 'paper' but it the best way to describe them) the keep you a lot cooler than full waterproofs and are splash proof.
We also carry waterproof full suits and waterproof trouser. I quite like the waterproof trouser and embroaded polo shirts it's not often on PW you splash above the waist.
Obviously eye protection.