The term "suede" covers all kind of leathers with a matte, napped surface. This can be full-grain leather (reversed), usually (but not solely) either calf or goat, Alternatively it can be the bottom split of a hide (which is grossly inferior).
One of the highest regarded tanneries specializing in suede is Charles F Stead in Leeds, UK
http://www.cfstead.com/index2.htm
Unless you, as an individual, have access to a leather merchant, you won't be able to determine the provenance of the leather used in a particular pair of shoes.
