I always have visions of having these great theme parties where everyone dresses up, and it just doesn't happen. I guess I should be lucky if they dress up at all! Some of the folks are pretty flakey when it comes to Halloween! I still might word it somewhat that way, and incorporte a room or 2 with some basics, maybe going to try for the haunted speakeasy. Moneybags, dead bodies, money dumped on the floors.... Then maybe on the invite just give some costume suggestions, like you said, it might help out the folks that are having trouble, but still gives you the option to dress as you wish?! I don't know, just rambling now, but what's the point of a theme then? My own enjoyment?