In reply to fire_munki:
As a big buffalo fan, I'd not recommend it to the OP as its not waterproof. Heavy rain will wet it out even if brand new.
OP - I bought a cheap set of nylon/PU coated sallopettes for sailing in from a fishermans Co-op for about £15 which have been great and toally waterproof. Are a bit sweaty when having a wander about on land but not too bad. If your anywhere near a working fishing port it may be worth having a look to see if they have any similar type stores.
Cheers,
Stuart