kaaya ruupa sanyamaat tad graahya shakti stambhe caksuhuh prakaashamprayoge’ntardhaanam (Yoga Sutras, III, 21)
By sanyama (cessation of mindstuffs) on the form of the body, while suspending its ability to be seen – that is, the disconnecting of the light to the eye – there arises invisibility (placement within)
Word has it that the Great Maharishi Mahesh Yogi would sometimes give this siddhi to select members of his meditation group in the early days of the movement. He stopped when it was apparent so to speak that the comrades of the dissapeared siddhas got upset.
The technology (http://news.wired.com/dynamic/stories/S/SCI_INVISIBILITY_CLOAK?SITE=WIRE&SECTION=HOME&TEMPLATE=DEFAULT&CTIME=2008-08-11-07-36-38) inherent in this ancient sUtra is striking too in that the Western military is just catching up no