http://www.rense.com/general57/RFIDtrackingdevicestogo.htm
They are already putting them in clothing (sewn in). Now for these to be useful to them, there would have to be a satellite network dedicqted to picking up these things, especially if they put micro or nano-sized transmitters inside the chip that is hidden in the clothes. Are they just interested in where their high-end clothing wanders over the earth and neighborhoods, or are they collecting lifestyle info on the buyers and wearers so as to target them for advertising specifically tuned in to their wants and needs?
They already do this sort of profiling on the web from everywhere you click.