whatever you get, ensure it's BREATHABLE.
I got an Akito oversuit once (still have it if anyone wants one
) which is straightforward PVC. Just like a turkish bath, if it's at all warm weather the condensation inside it means you may as well just stay out in the rain, and it then sticks to your leathers so you can't get the ****ing thing off!
Now use Flexothane Hi-vis oversuit, breathes like a pack of Tunes.
Brilliant stuff.