In reply to mjt:
I have a nice little card which came with an item of mammut clothing which you might find useful:-
Euro size waist inside leg
50 34 33
52 35 33
106(104) 35 36
110(108) 37 36
They don't appear to do a 35/34 or 36/34. I've a pair of size 50 mammut schoeller trousers and they're long for the quoted inside leg.
Maybe find a Dutch outdoor retailer as Dutch people are generally tall? do you actually need the 34" inside leg if you wear boots?