UPDATE: SimGuruNinja has confirmed that Skeletons are only an affliction and cannot be created in Create-a-Sim.
Skeleton-ism (that’s a term, right?) is an affliction your sims endure. You can’t create them in CAS.
— Dave Miotke (@SimGuruNinja) February 14, 2018
If you can get them into CAS then hats and accessories can be put on them, but those additions will not appear when re-entering Live mode.
— Dave Miotke (@SimGuruNinja) February 14, 2018
SimGuruNick has just updated his Twitter avatar, showing off a Create-a-Sim backdrop with a Skeleton in it. There was an image released today as well that shows off a skeleton maid, so could skeletons be a new life state players can create in the game?