Dour Fancy, for the dour enthusiast on a reluctant special occasion.
Sure, you'd rather be in your darkroom, or tending your Insectarium, or in the turret of your cool-in-Summer castle, with a book, but today the outside world calls and you must reply. May I recommend this dress?
It's all black. It has panels of cotton eyelet and a swirly-black lacy-ish material, both fully lined, plus it has super long ubersleeves — overlength sleeves made for scrunching up.
Or you can pull them way down over your hands and if anyone makes eye contact or starts to speak, flail the sleeves all around and sing "SOOOOOOOOOUP OF THE EVENING" until they retreat.