What's an easy way to get a rim light?

[AtlantaTerry]

Thanks Terry! Makes a lot of sense!

Imagine I'm shooting a boudoir scene in a hotel room.
A large window is providing both the key light on the subject and the ambient light for the room.
I'm shooting wide open and at 400 film speed.

Now I want to outline my subject from the background with a kicker. Ideally as soft as another window light.
I don't want that kicker to influence the ambient light.

How would you do it?

Actually, in this situation I would use a large softbox as a kicker. This will allow the model to move around and it will give a nice smooth even illumination to a wide area.

The key to your question is "as soft as another window light". If you think about it, you answered your own question.

Use 20x30 inch black cards to block the light from going where you don't want. Or, if you have one, an eggcrate on the soft box. Or both.