Is this from the Prada F/W 2005 collection? Hell, they sold for $595. If it sold for that much, it had to have been top of the line leather right? Right?
(not a serious post)
Back to the program....while I cannot tell the difference between brands, I have found that paying attention to this forum for a good 2 years has at least trained me to notice the attributes of a nicer suit. To Claghorn's point above, the cheaper materials and construction are usually the giveaway after some usage. On cheaper wares, shoulders get wonky, fabrics get weird textures, lapels are lifeless, the back hangs mis-shapenly (made up word), etc.