While depending on leg length an torso, a miniskirt is generally no more than 15 inches in length and hangs no more than 4 inches below the butt. Many modern versions go much shorter, with "micro-skirts" measuring 6-8 inches in total length.
She is wearing a very short miniskirt, but it is pretty.
Surely trhe answer must be when it gets short enough that a guy would not have to use his imagination...
Place your arms by your sides and where the middle finger's tips are is how short the skirt should be.
Mary Quant designed the miniskirt
miniskirt
http://images.google.com/images?q=mature women in miniskirt
A minidress
Miss Shellagh's Miniskirt - 2008 is rated/received certificates of: USA:R
Miss Shellagh's Miniskirt - 2008 was released on: USA: January 2008 (Seattle, Washington)
Miniskirt
miniskirt
Tawny Roberts. HOT.