The suit itself is not a marvel of handwork which would be impossible at that price level...
As the tailor has his shop in nearby Slovakia the price level is - compared to other Austrian tailors - interesting.
Why would you associate prices with the quality? Anyway.
That makes estimately half/half - tailor/fabric
For comparison: Netousek would charge you around € 2000,- for a similar suit.
So, I cannot agree with udeshi's argument, that J&N prices are stratospheric and only emperors can shop there.
J&N prices are on par with O. Niehl, who's their direct competitor, by chance right down the street, but with an odd store decor.
I doubt, that the fabric prices in London are lower, than in Vienna.
But, if you are looking for a good deal in Vienna. You can visit "Finder", buy some cloth/fabric and visit the tailor in Bratislava.