Anyone who is willing to try this "glitch" how about you go buy Any colour Elegant blouse or skirt and put it on? I was trying to work out the glitch as a male with female clothing and I clicked to put it on and it just went on, no glitching needed thainerr is fake.
"Nonetheless, the costumes may be worn interchangeably between the genders. "
Source:
http://runescape.wikia.com/wiki/Elegant_clothing
Stop bullshitting everyone.