It really depends on the model and your personal preference for fit. The Pro Hunter in 34" (50) fits me nicely on the waist, but is far too tight in the crotch and knee area, however the Pro Hunter X in size 50 is a perfect for me (and far superior in comfort to the Pro Hunter).
The Field Trial trousers I have are a better fit in 36" (52).
I ordered the new Raptor suit with 36" (52) trousers, but the fit was way too big. I felt like a kid dressing up in my dad's suit! Needless to say it went back.