This is the little Japanese Knight Gundam whom I've based Song's looks off of. The colors are just about the same -- save for the feet, which are silver to match the rest of her, and the jewel in her chest, which is golden yellow. Her chain helmet doesn't have the little red and black decal there on the front, either.
As a side note, those spikes on her sword are freaking sharp. Jabbed myself with one when I was getting her sword back into her hand and not only did it bleed but the mark is still there. What a contrary little gundam.
Yes, the chain armor is included with the original toy. I'll post a couple more pics in a bit of the different expressions that came with the toy. It's an amazing toy, I highly suggest checking it out!
Photos taken with a Nikon D40 18-55mm lens inside of a portable photobox gotten at thinkgeek. No photo-manipulation was done (simply because I don't have a program for it on my computer yet).
Per request, he is called SD SDX Knight Gundam Retsuden Chogokin and there are a few of him on Amazon from between $45-$60.