Never bring only one option...

Even if you KNOW what they are going to pick, even if they told you to bring a specific fabric as it is chosen, always make sure to bring alternate option.

1.  The fabric may become discontinued, back ordered, or otherwise unavailable.

2.  It never hurts to have another piece that will show off how nice the one they selected is.

3.  What happens if they didn't realize how much that piece costs and it is more than they want to spend?

People want to feel as if they have selected the best choice.  Even if you leave the other options in your vehicle until such a time as they are needed a professional always has another option (or two).