Apart from the obvious problems like falling in a stream or water coming in the sleeves when you reach up, if you sit on wet ground water will be forced through the fabrics.
The other problem is sweat and insensible evaporation from the body. The first is obvious, but the latter will occur even in cold conditions. When the weather is cold and wet, with 100% relative humidity, it is very difficult to stay completely dry. The key is to stay warm and I'd recommend adding an overshell (belay) jacket over the top. The shellTA is also useful, especially for stops, when you aren't generating much heat.
However, FurTech will keep you dry in many circumstances when the best conventional waterproofs leave you wet and, even after complete immersion, dries relatively quickly.
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