A skeleton corset has no fabric between the boning channels, just a few horizontal tapes to hold the bone casings together.
Most examples are late 19th to early 20th century, but they can be found mid-century too.
Amanda Lerum Faulkner shares photos, details and a pattern for an 1869 American skeleton corset in her collection. Next month she'll share a step-by-step tutorial to reproduce its unique busk.