Huh, strange. It seems like a lot of trouble to climb up onto the window, stamp the dirt off boots, and then run to be rid of everything at the stable anyway. Unless she was killed right after he left, but it doesn't seem likely... probability isn't a factor in this equation.

For all we know, any dirty clothes could just be hiding in that manmade hole by the fence, but if we still haven't found anything in the mansion yet other than Kanaya's dress upon the discovery of the victim's body. Where else could it possibly be?