Help regarding austrian surplus

So, i'm in the market for current issue OD green Bundesheer pants and possibly some pea dot as well, and it just so happens i'll probably be buying them in Wien.
Could anyone that's a local direct me to a few good milsurp shops that have what i'm looking for, and also give me a list of fair prices?

Also, any help regarding the Austrian sizing system is appreciated.

P.S. Would it be possible to find Alpenflage somewhere in Wien?