During the Big Time storyline, in an attempt to defeat the new and improved Hobgoblin, Peter creates a stealth suit. He is able to do this through his new job at Horizon Labs. The Stealth Suit warps light and sound to become invisible and totally silent, it is also impervious to sonic attacks. He also created special lenses so that he can be seen by people if needs be. The lighting on the suit can change between green, orange and blue. Orange is for the secondary mode which disrupts sonic frequencies from infrasonic to ultrasonic but is visible. Blue is it in normal mode which can be seen and heard. However, a side effect of this costume is that while he can be impervious to sonic attacks, it also prevents him from hearing others. For example, while fighting the Hobgoblin and the Kingpin, Spider-Man was unable to hear the Cat's cries for help.
Halloween costumes are costumes worn on or around Halloween, a festival which falls on October 31. An early reference to wearing costumes at Halloween comes from Scotland in 1585, but they may pre-date this. There are many references to the custom during the 18th and 19th centuries in the Celtic countries of Scotland, Ireland, Mann and Wales. It has been suggested that the custom comes from the Celtic festivals of Samhain and Calan Gaeaf, or from the practise of "souling" during the Christian observance of Allhallowtide. Wearing costumes and mumming has long been associated with festivals at other times of the year, such as on Christmas. Halloween costumes are traditionally based on frightening supernatural or folkloric beings. However, by the 1930s costumes based on characters in mass media such as film, literature, and radio were popular. Halloween costumes have tended to be worn mainly by young people, but since the mid-20th century they have been increasingly worn by adults also.