When I’m attending events underground in 5 degree weather, I always try to wear layers. The low-albedo outerwear helps absorb any sunlight, and it also provides a nice counterpoint to the earth tones I’m accessorizing with. Today I’m wearing a collectible “Walden VI” hoodie ($35 new): the rare version from 2006 in which Henry David Thoreau is shown riding a giraffe in a circus car. I’m pairing with matching thermal trousers made of “nanofibers” by an Israeli firm ($16 new), along with a pair of black neoprene boots gleaned from a lost-and-found pile (price unknown). To emphasize the efficient, decisive nature of my wardrobe choices, the pants are on backwards.