suicide smock
n.— «A year-and-a-half-ago, Grove tried to kill himself, according to court documents. For that reason, the Boulder County Jail has placed him on suicide watch, and in his mug shot—the one with his hair standing wildly on end—he is wearing what is known as a “suicide smock,” a garment that can’t be made into a noose.» —“Damm case: Kids next door?” by John Ingold in Lafayette Denver Post (Colorado) Mar. 12, 2007. (source: Double-Tongued Dictionary)
Further reading
Susan from Virginia Beach, Virginia, shares the phrase her mother used when the kids refused to eat: It’ll grow hair on your back teeth. This supposed motivator likely blends two older traditions: a German idiom, Haare auf den Zähnen haben...
To describe something tiny or insignificant compared with something vast, you might reach for phrases like a drop in the ocean or a drop in the bucket. In Mandarin, there’s an equally picturesque phrase that translates as nine cows, one hair, 九 牛 一...