For the whimsical, here's a new product demonstration. This is a Hen Holster, a combination diaper plus harness. The D-ring on the back allows a leash to be attached.
I'm tempted to try this with Blondie, my gregarious pullet. She loves to get out and about, but our yard isn't fenced. She'll be the Display chicken when I speak at a paso Robles school next month. She has Star Quality.