The invention relates to an anti-fall work garment, provided for use in environments where there is a risk of falling from a height. The garment can be traditional overalls or a bib, according to the climatic conditions and usual work clothing in such environments. The garment incorporates a security harness that forms an integral part of the garment and is pre-attached (the harness being washable, with resistance properties suitable for preventing the breakage thereof during use). The harness is perfectly fastened to the garment, such that most straps and belts adjust to the size thereof, it being necessary to adjust only the chest belts that close the garment. Thus, the user cannot be detached from the harness while wearing the garment, preventing unnecessary risks.