Many costumes use a front full-length zipper or a hidden center-front zipper with a zipper guard. Some also include hook-and-loop (Velcro) fasteners and elastic at the waist to improve fit.
Yes — many costumes feature fiber filling or padding in the chest and arms (and sometimes in boot tops) to create a muscular or armored appearance.
Masks are typically fabric or foam-backed fabric with cut eye holes for vision and an elastic band or strap to secure the mask comfortably on the head.
Listings commonly highlight reinforced seams and stitching, partial lining and a cotton gusset for durability, plus features like elastic at the back of the waist and a straight-leg fit to improve fit and comfort.
Costumes use all-over Iron Man graphics and high-resolution prints to reproduce armor details and vibrant character colors, creating the look of the suit across the fabric.