Most red devil suits are made from polyester; many product listings specify 100% polyester.
Closures vary by style: some jackets use zippers (including off-center front zips), some tailcoats use a single faux button with hook-and-loop, and jumpsuits often zip at the back. Pants and leggings typically use elastic waistbands.
Tails are usually attached to jackets or jumpsuits and may be satin or include wiring for shape. Horns are most often mounted on headbands or sewn onto elastic chin bands.
Wings typically use faux-leather shoulder straps that are length-adjustable with metal buckles to help secure and fit the wings comfortably.
Leggings are described as stretch knit with an elastic waistband for a snug fit. Pants often have an elastic back waist (and sometimes a faux front fly) to provide flexibility and comfort.
Headwear is typically a horned headband or soft sculpted horns. Horns are commonly attached to a headband or sewn to an elastic chin band to help keep them in place.