I used doubled over thick cotton batting and covered it with black out curtain fabric. It was cheaper than pleather and matched the matte sheen of the shoes better.
I actually just printed it off from a vector image I found online and mod podged it onto the shoe. Not 100% accurate (since it's not fabric/thread) but looks good for photos!
I got the pants on ebay - they're actually capris (for some reason that's all I kept coming across in that color/style!) so I let the hem out and got them JUST long enough to stuff inside the shoes. The brand was Xhilaration "light blue cargo pants"
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This may show a bit more detail on the shoes (click on it for the full size)
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File I used for the logo on the tongues