armour

Looking for new hydration pack and chest armour. The old chest armour I have is good but getting a bit small and uncomfortable. I'm looking for something that breathes well as its hot as hell in Brisbane (Australia) but is also comfortable and won't move around when I'm riding approx price...

that jacket has shoulder, elbow, and stretched diamond shape back sleeves for armour. Does anyone know if there was particular armour made for the jacket, or is it just in case you can find some that fits?

Other than the obvious good quality lid & boots, what's your views on body protection for general purpose non competitive off road / enduro ? Under vest full armour with kidney & back protection or over vest stone / chest guards with seperate kidney belt or just decent enduro armoured jacket...