That's a great costume! I am leaning toward a witch again (I know, not very original). And I'll probably do the green skin thing again, because I dislike masks. They are hot and uncomfortable. I have the black robe already for the witch. My cap has lost its stiff peak; not sure whether to try to starch it or just buy another.
Since I have taken kids TOTing for, like, the last 21 years, I have always bought the glow necklaces. I'm not sure that I'll be taking my daughter this year, though. At 14, she will most likely go with friends. However, I love the glow necklaces, so I may wear some anyway. They have nothing to do with the costume. I just think they are fun.
Clearly, I am not a perfectionist when it comes to Halloween. Fun is what it's all about for me.