Only considered as ecchi when nether regions/female chest is skin-colored, transparent or not fully covered.
A bodysuit, body-liner, or body is a one-piece form-fitting garment that covers the torso and the crotch. The bodysuit often has sleeves and varying collars. A bodysuit is distinguished from the similar leotard by the use of snaps or hooks at the crotch. A bodysuit may be worn as a top for the smooth line it gives or because it cannot become untucked from trousers or a skirt. They may also be worn generally by women as underwear, activewear, or foundation garments. Unlike a leotard, a bodysuit is not usually considered a form of athletic wear.