Accurate maps help keep ships safe at sea. In the thirteenth, fourteenth and fifteenth centuries, maps called "portolan charts" recorded the accumulated experience and wisdom of generations of Mediterranean seafarers. Portolan charts were practical, no-nonsense tools made for the use of sailors who sailed "great waters."
These leggings feature a portolan chart from the 1547 Vallard Atlas. It shows Europe and the Mediterranean during that strange period where North appeared prominently marked on the compass rose but wasn't necessarily up. In fact, looking closely at this map, its hard to tell if it even has an up.¹
¹ Afternoon Map: Up and Down Again. (n.d.). Retrieved April 10, 2016, from http://www.midafternoonmap.com/2016/01/up-and-down-again.html