Clothes for rainy weather

Talking of Montane, they do a very, very thin pullover windshirt which packs down to the size of a small apple (water-repellent rather than waterproof). Highly recommended as you can stick it in a jersey pocket and forget about it until the weather goes bad, at which point it's just enough to stave off hypothermia.

yep you can pick them up quite cheap too - I got one for £15 a while back from Rock & Run - essential bit of kit. Have worn mine on Munro tops with a hoolie blowing full force in Winter with a base layer on underneath and not been troubled too badly

http://www.montane.co.uk/productdetails.php

http://www.outdoorsmagic.com/news/article/mps/uan/2184

Paramo do a similar windproof oriented piece called the Fuera Smock

http://www.paramo.co.uk/en-gb/garments/detail/index.php?pgc=NIKWAXWINDPROOFSMOCKFUERAUNISEX

http://www.outdoorsmagic.com/news/article/mps/uan/3431