Pancerny Napierśnik and other 69,000 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
There is a single object that looks like a breastplate, or a t-shirt without any arms and a large collar. There is some detailing to the shoulder area where extra lines are placed, and the same around the area where the waist would be.