#2 naked, nude and invisible???

there is a rumour that some magic practitioners can make themselves invisible, but only when they are completely nude, naked! so when they swiftly remove their loose clothing, and say how "saft" they are, or something, they then disappear from view, and often then run up behind people and punch them on the back of the head, it is said that various criminal gangs have used this technique for raping, mugging, committing frauds and making get-aways... anyone heard about anything like this?