The Tana's a quite generously cut, I'd say. Very comfortable from first wear - in fact I was a bit worried they would stretch out too much but no problems so far.
I will say they are not quite as waterproof as trad docs! Fine for normal rainy days as long as you avoid jumping in puddles though 
I didn't know they came in brown too, only saw the black and red when I got mine... Will be keeping an eye out in the sales!