In my opinion it's necessary to experiment with different layers.
I read in internet forums that a lot of people swear by merino wool base layers but I am only comfortable with them if the temperature is lower than 5*C.
I returned to relatively thin pure cotton T-shirts as base layer and little and thin cheap cotton breefs in most conditions.
Over that I usually wear a 20% polyester 80% cotton oliv green German army field shirt (how it is still delivered factory new only by A.Blöchel, Neuhaus am Inn) that is a midges proof pretty thick classical outdoor cotton shirt with buttoned flaps over the pockets. They both wick moisture away from my skin, but obviously I get some airflow in between them, which dryes them out a bit.
Over that I usually wear a light or middle thick polyester fleece jacket, usually open, in dry conditions I prefere over it a light field blouse, Flecktarn or Austrian, both 35% polyester, 65 % cotton, and in whet conditions I usually put directly the rain jacket over the polyester fleece jacket, sometimes over the field blouse which I don't carry always with me.
I avoid to put the relatively heavy field blouse into the rucksack but better works to wear the rain jacket directly over the fleece jacket.
Field blouse as outer layer over polyester fleece works OK in short showers, somehow the body heats the moisture out pretty fast. The thin field blouses are relatively fast drying but tight woven and so they are wind proof and if wet they get a bit water proof like the old cotton tent sheeds.
With closed rain jacked in use I reduce the speed of my movement. That's the secret in my opinion how to stay dry from inside.
I use cheaper light rain jackets as well as the German Army Goretex jacket and trousers which are made from Goretex three layer fabric. The Goretex suit works technically better than the light stuff which I carry if I expect mainly dry weather. But they work technically OK under 20 *C, perfectly under 16*C.
In warmer conditions I prefere the non breathing Italian army lightweight poncho Defcon 5.
168 x 200 cm, 350g weight without its little bag.
D5-PO-02 - DEFCON 5 WATER PONCHO - Jackets
www.defcon5italy.com
(By the way: The German army currently uses a Flecktarn Goretex poncho additional to the Goretex suit. And this poncho is sold factory new to private users too.
150 X 220 cm, 860g
Price here for the factory new poncho:
BW Poncho nach TL aus 3-lagen Laminat. Das Material ist atmungsaktiv, wasserdicht und gemäß TL 8305-0290 mit einem IRR Schutz…
www.recon-company.com
I don't own it because I find it too heavy and not wide enough, but because it's an interesting piece of equipment I mention it here.)
Or I simply wear very thin cotton or polyester cotton mix fabric clothing in hot conditions and have nothing against to get whet, because the clothing will dry pretty fast after the rain stopped.
I discovered that waterproof over trousers with pocket zippers but no own pockets are a very good idea, because if you open the zippers you will pump with every step the inner moisture outside. That works like opening the rain jacket for ventilation or the zippers under the arms (what my current rain jackets unfortunately don't have).
My lightweight Solognac 100 rain over trousers as well as my German army Flecktarn Goretex trousers have those pocket zippers without own pockets.
(My lightweight rain jacket is called Solognac 100 waterproof jacket, modern, civil looking, pretty short and unfortunately not very long lasting if used with heavy load. But I use it most of the time, because I prefere a very compact packing lightweight equipment and always have the Defcon 5 poncho with me which I use instead of a tarp as shelter in combination with the 350g Snugpak Special Forces bivvy bag, and so I have the poncho additional for heavy rain if I am hiking.)
I usually prefere a longer, the area of the underwear protecting, rain jacket and 35% polyester 65% cotton mix fabric trousers like Flecktarn or Solognac Steppe 300.
Until 0*C usually nothing else under them, if its colder thin merino long John's or often enough just rain over trousers over Steppe 300 because I don't have the long merino underwear with me. That works around 0 to -5*C pretty well if the zippers of the over trousers are open.
Since I have seen polyester cotton mix fabric trousers with long ventilation zippers at the back how they are offered by Scandinavian outdoor brands and a well known German workwear outfitter, I asked myself if that wouldn't be the best solution for waterproof trousers and I recently discovered that the special forces of Sweden, Norway and Denmark had the same idea and ordered it out of Norvegian production!
The fourth generation recon Gore-Tex Pro pants are a redesigned version of our now legendary heavyweight Gore-Tex Pro pants and truly one of the finest waterproof, windproof and breathable outer shells on the marked.
www.norrona.com
The recon Gore-Tex Pro Jacket is designed to meet all the requirements set by the military and is suitable for all-round hunting, expeditions, glacier walking, trekking and general outdoor pursuits.
www.norrona.com
As you see that looks pretty convincing, but I unfortunately currently don't have the necessary pocket money to try this rain suit out immediatly.
Do cheaper versions exist somewhere which have those long ventilation zippers in the trousers too???
If not, I guess I will have to save some money to report later here if this rain suit works fine...
And, as we touch here factory new sold high end military rain suits in oliv green, I would like to know if somebody here uses this Carinthia PRG suit:
www.carinthia.eu
www.carinthia.eu