Work wardrobe essentials fall/winter

My idea of office sexiness is pencil skirt with a bib front shirt (or any shirts with nice details) and a pair of sling back or pump. Its not too conservative and still says sexy.
 
I love a neat office-appropriate dress with mid- to high heels and a longer coat over the top. A silk blouse with a neat detail over a well cut pencil skirt in great quality fabric with some classic CL slingbacks is office appropriate and still fun.