How to reproduce the cravat knot seen on Charles Babbage
here. It's also the same knot used by Doc Cochran on Deadwood.
Babbage's version uses a relatively stiff fabric, and a cravat that is roughly the same width throughout. Cochran uses the same knot with a softer fabric.
Instructions on the knot can be found
here. It's basically the same as tying a bowtie, if you happen to know how to do that.
The cravat in the instruction set is widens towards the end, which will give the nice puffy bow instead of the severe one Babbage wore.
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Damn. I think this means I really am a costuming geek, doesn't it?
Now I need to make some more cravats with a variety of fabrics, widths and styles...