pants
You see lots of things left behind... a glove at the bus stop, a stray hat or something else equally as non-descript, but what you don't normally find are pants.
There they were, a newish pair of dark blue jeans, left on the planter box outside one of the local variety stores. Too far away from the bus stop to explain a wait, too public to explain someone getting up to Personal Business. The oddest thing about them, though, was their placement. They didn't look dropped or thrown, they were somewhat stretched out, not folded or unfolding.
They looked like the person in them had just dissipated, just fell out of existance while still wearing them.