You look fantastic in that dress, and I say wear and enjoy! I tend to save "nicer" pieces for only dressier occasions too, so they languish in the closet, even though they deserve some play time. Meanwhile, my cut-off (clamdigger length) shorts get worn all the time, and I'm sick of them and ready to put them away after the hot summer.
I think you've already gotten some great suggestions for footwear. I like the idea of metallic -- bronze, champagne, platinum, or even gunmetal.
I'm still kind of sad that I look so meh in this dress.