"The Long Earth", a collaboration between Stephen Baxter and Terry Pratchett, opens when a series of seemingly infinite parallel worlds are discovered right next door to Earth and can be accessed with a simple device called a Stepper. There are also natural steppers who can simply walk to these worlds - one step, one world. The book mostly revolves around Joshua, a natural stepper who's been assigned to an expedition to check out these worlds. It follows him and Lobsang, apparently a Tibetan motorbike repairman who's been reincarnated into a computer, as they travel from world to world and see how it differs from the original Earth (now called Datum Earth.) There is a subplot with a policewoman back on Datum Earth, which shows how this discovery affects the world.
When putting together an outfit inspired by the book (I always try to with my reviews), I'd thought about clothes one would wear while Stepping, but that would involve layering and hiking boots and things that make me sweat just to think about, so this is an outfit that mimics the book cover instead.
Big thanks to Jess for letting me rant on her blog. Have a great vacation, Jess!