While at UC Berkeley, I'd host a lot of events for the Hiking Club. A Dutch grad student would bicycle over in the afternoon, stay late, and have to pedal home. He'd have an over-sized windbreaker but nothing warm on. He'd ask an old newspaper and crumple up 20 sheets and stuff them into his windbreaker, held in by the waist band of the windbreaker. I've used that trick a few times since.
So, yes, it works. I'd lean towards something that you had with you - your groundcloth, your tent, your extra socks, etc, as being more insulative (and something you have to carry anyway) than the sticks, pine needles and rotting leaves you might find on the way.
Why not use your tent during the day? Your groundcloth, your dirty socks? Okay, lots of reasons not to, but they don't apply to you lot.