The eagle is usually shown as metal, along with the badge and belt buckle. One of the problems with Dredd is that different artists and colourists have felt free to use their artistic freedom when rendering JD. That's not a problem really. My personal preference is the black helmet and uniform, green boots, gloves, and elbow pad, and the left shoulder pad in yellow. However, if you go with dark blue for the uniform and a yellow elbow pad that is OK as well as 2000 AD artists can't even agree on the colour!