Sorry, I had no idea that it's important.
Well, after checking it on the armor, I've concluded that if I would like to make it looking really good, I'll need to remade both texture and UV mapping for this armor (with additional fixes for his shape as well, since it looks a bit squashed [or whatever is a proper word for it] when checking in inventory). For now on, this texture remains blurred on some places just because of pitiful UV and/or poorly design of texture's parts.
So thank you very much for hi-res texture and for your time, but it seems that the hi-res texture is just not enough in this case.