Unadorned; spare; minimally accoutered: as it attempts to upgrade its image from a bare-bones discounter
[1970s+; fr the phrase bare bones, ''mere skeleton,'' which is attested fr the 1600s]
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with bare-bones
The mere essentials or plain, unadorned framework of something, as in This outline gives just the bare bones of the story; details will come later. This phrase transfers the naked skeleton of a body to figurative use.
[ c. 1900