Mule is style of shoe that has no back or constraint around the foot’heel. mules have history going as back as ancient rome, even though they were not popularly worn until sixteenth century europe. [citation needed] there, mules were bedroom slippers and not worn out in public.throughout the centuries mules have changed in style and purpose.The american ss guide to th century dressmaking how to hand sew georgian gowns and wear them with style [lauren stowell, abby ] on amazon. *free* shipping on qualifying offers. bring history to life whether you wish you could time travel to the court of versailles or the highlands of scotland History. the style originated