Took about an hour - not entirely complete, and sort of randomised / organic in the direction it took. Quite happy with it though.
Used Inkscape to draw the lback and white vector shapes and various programs to add the spats and colours.
Referenced from a photo I took of my friend Fran on a night out.
See a larger version on my DeviantArt account.
Second version using the same 'outline' vectors as before. 30 minutes.