You know, I would have completely agreed with it being black, but now that I've gotten ahold of Thor volume 2, his tunic is most definitely blue during his fight with Bor.
I'm thinking I might go with the NECA Guile. His head is small as it is, and will look a lot smaller sans his ears and crazy hair. He even has the flat nose (kinda) I'm looking for.
Having read a ton of thor comics since asking this question, I'm inclined to say its more blackish-gray, and the only reason it looks blue in that one picture is because he's surrounded by lightning. Really, it makes more sense for it to be black, cause thats the color his old tunic was.
Maybe it's black with various of lighting and shades. Sabetoonth has a pic with black and yellow lighting, and you have a picture with black and bluish lighting. I guess it depends, but I think it's black.
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It's just like Thor's old costume, where some draw it black, and others dark blue. The majority seem to be black though.
looks black to me