Irene is so fantastic in this scene. She’s naked under that coat but it doesn’t matter, because she’s brilliant and dynamic and BAMF, and that’s why she’s sexy.
Sherlock’s looking pretty damn hot here, too, incidentally.
(I adore that Irene is pretty much a female Sherlock. They share the same coloring, similar features aside from the masculine/feminine cast, and similar approaches to life, ethics, seduction, and manipulation.)