what is the logic behind the costumes?
One word ..Saturnalia
After meeting idiotic female friends, back home on hen nights plastered, with cock shaped hats, cock straws, and T shirts with "I love cock" written on them. I began to think....,,since I knew these women for years and knew them to be squares,boring, catholic, and almost, afraid of cock. YES!!! its a form of Saturnalia, for boring office workers whose usual social life evolves around Coronation Street and Sex in the City.
The best part of the Saturnalia (for slaves) was the temporary reversal of roles. Masters served meals to their slaves who were permitted the unaccustomed luxuries of leisure and gambling. Clothing was relaxed and included the peaked woollen cap that symbolized the freed slave. A member of the familia (family plus slaves) was appointed Saturnalicius princeps, roughly, Lord of Misrule.