A Mille Feuille is a french pastry that literally translates to “a thousand layers” or “a thousand leaves” – and that’s the secret to the gorgeously full skirts you see some of your favorite vintage ladies sporting: layers upon layers. As I’m sure most of you have noticed by now, I am in love with petticoats. They come with many names – petticoat, crinoline, underskirt – but service a universal function, which is to give the skirt of a dress fullness and shape. Given that I own my fair share of crinolines, several lovely readers asked if I might do a crinoline…