in the altogether

in the altogether

Naked. I keep having the dream where I walk into my high school in the altogether!
Farlex Dictionary of Idioms.

*in the altogether

 and *in the buff; *in the nude; *in the raw
Fig. naked; nude. (*Typically: be ~; get [into] ~; sleep ~.) The museum has a painting of some ladies in the buff. Mary felt a little shy about getting into the altogether. Bill says he sleeps in the raw.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

in the altogether

Also, in or stripped to the buff ; in the raw. Naked, nude, as in The art class wanted a model to pose in the altogether, or She was stripped to the buff when the doorbell rang, or He always sleeps in the raw. The first of these colloquial terms dates from the late 1800s. In the buff, a seemingly modern locution dates from the 1600s, buff alluding to a soft, undyed leather, buffskin, that also gave its name to the color. The use of raw, presumably also alluding to raw (undressed) leather, dates from the early 1900s.
The American Heritage® Dictionary of Idioms by Christine Ammer.

in the altogether

without any clothes on; naked. informal
1991 Today The mothers…have agreed to pose in the altogether.
Farlex Partner Idioms Dictionary
See also:
  • pillow-biter
  • (something) blows
  • on one's
  • on someone's
  • (as) gay as a three-dollar bill
  • (Have you) been OK?
  • other than
  • other than (something)
  • a copy
  • out of one's