Another top-level circle? Clothing, from hats to shoes.
I don't see a topic here that relates to issues around what we wear, indoors and out. But if shelter becomes less sheltering, and low-energy transportation options involve more exposure to the elements, we may need to give more thought to the shelter that we carry around with us: what's cool in warm weather, what's warm in the cold, what keeps us dry in the wet? In addition, the clothes we wear convey information to those who see us, so "fashion" is also a valid topic to consider.