one-piece

1. not comparableComposed of a single integral unit, or so appearing.

   A man's one-piece swimsuit can be as small as a jock strap, whereas a woman's one-piece swimsuit covers both the genitalia and the breasts.

   3 more examples

   A one-piece metal hammer with an applied rubbery handgrip is nonetheless one integral piece, because the head, shaft, handle, and butt are cast in a single mold and/or forged as one seamless unit.

   The connecting rods are one-piece forgings of alloy steel with a copper/lead steel-backed bearing at the large end and a phosphor-bronze bush at the small end.

   1958 April 28, “British Railways First Main-Line Diesel-Hydraulic Locomotive”, in Railway Magazine, page 265

   The two-axle bogies, of Metro-Vick swing-link type, are of one-piece cast-steel construction with box-section side frames and headstocks.

   1960 December, “The first hundred 25 kV a.c. electric locomotives for B.R.”, in Trains Illustrated, page 728

plural one-pieces

1. A one-piece article of clothing, especially a swimsuit.