The British Museum, in London, is currently hosting an excellent exhibition on the Scythians, with numerous examples of armour, grave goods, textiles, saddlery and other things relevant to your question. Even if you aren't in London/can't go there, you would find the exhibition catalogue very helpful, as it's illustrated and provides a lot of in-depth contextual information. More information and a link to buy the catalogue, here:
http://www.britishmuseum.org/whats_on/exhibitions/scythians.aspx