Playing in the UK, golfers are no strangers to the occasional poor weather. Playing a round in a heavy, lumpy jacket will do little for your game, so getting waterproof apparel is perfect for all players as it both protects from rain as well as remains lightweight and unrestrictive curing play.
There are many variations of waterproof attire, and you can check out Buying Guide to Waterproof Apparel should you need further explanation on any clothing you wish to purchase. Waterproof clothing is the best option as it keeps you dry during play without weighing you down. Other variations of waterproof attire which are also useful in other ways include Rainproof/Showerproof apparel.