It rains over here and I have rain gear.The goretex jacket and a couple of others. My favourite one for summer is a Waterproof top made of "Nylon" type material that has a water prrof coating. Vents under the arms- down the sides and across the back. And a full length zip. I got it from a Hiking shop and is made by Karrimor but must be others about. It is also windproof which is a bonus up on the hills. The big bonus is that it is lightweight and will fold up and fit into a jersey pocket. I know it doesn'y breath but the zips make up for that but when it does rain- I stay dry - even with the vents fully open. More important for me though are the waterproof socks for summer. Sealskinz and they work.
But if prolongued rain is forecast then it is the Goretex. Not too heavy but a bit hot if it is just Showers.
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How long was I in the army? Five foot seven.
Spike Milligan