I suspect the D.C. Police will interview the Cadets responsible for searching this area a year ago to determine if the spot was overlooked or positively searched.
This body was brought by vehicle on the Broad Branch Rd at the top of the bluff, and brought/dragged down until the incline starts getting really steep, and there buried in a shallow earth grave.
The other items related to her jogging, would have been dumped with it to make it LOOK like the casual murder of a jogger, but May Not Have Even Been What She Was Wearing When Killed, remember someone had access to her apt. and sanitized it, and perhaps the computer too, and they could have got the clothes from there...
The clothes looked like they, with the walkman, might have just been scattered around the area, not ON the corpse at any time, just left near it.