I have to attend a work part at the home of a 'big wig' for my husband's new job on Friday. It's a small liberal arts college in the mountain west. My husband said that it was business casual, but I just got the official invitation away from him and it actually says "casual dress" !

I'm already a bit intimidated by the status change that comes with this new job (I'm a state analyst). I really, really, don't want to show up looking inappropriate. There will be about 300 people there.

I had planned to wear a silk sheath dress from Ann Taylor (thrifted) with low open-toe nude heels. I figured that was a tad dressy but within range. Now I'm thinking that will be way too dressy. Husband will probably look like a Banana Republic ad.

The dress is white with a watercolor floral pattern.
Help!