Shop our eerie collection of Grim Reaper Costumes. If you are looking for a trusty outfit for this Halloween, then look no further than the Grim Reaper costume. An easy outfit, typically made from a long black cloak, sometimes a mask, but always a scythe, and guaranteed to frighten your friends! The Grim Reaper costume personifies death, and in some mythologies, they even cause the victim's death by turning up to collect them.