"Have you tried the thermostatic neck frill yet?"
According to Wikipedia, "Neck frill is the popular term for the relatively extensive margin seen on the back of the heads of reptiles with either a bony support such as those present on the skulls of dinosaurs."
But what I meant was a ruff, such as one typically imagines as essential to Shakespeare's get-up.
Hmmm...Quite fashionable. A thermostatic (temperature-regulating) ruff would be kind of awesome, actually.