Oh my, I can just imagine Nakita having this around her neck. Since she's so small I don't think she would have the strength to lift her head. She'd look really peculiar! She would look like she is permanently mooning the world.

I say stick with the leash and harness. All cats should be supervised when they are outdoors, whether they are enclosed or not. You never know when one may get stung by an insect or something else happens.

This is another option I came across awhile back:

Purrfect Fence

This one is based out of Toronto, but I'm sure you can find them elsewhere (beware...expensive!).

The Cat's Den