Elsewhere in Europe, mumming and hobby horses were part of other yearly festivals. However, in the Celtic-speaking regions they were "particularly appropriate to a night upon which supernatural beings were said to be abroad and could be imitated or warded off by human wanderers". From at least the 18th century, "imitating malignant spirits" led to playing pranks in Ireland and the Scottish Highlands. Wearing costumes and playing pranks at Halloween spread to England in the 20th century. Traditionally, pranksters used hollowed out turnips or mangel wurzels often carved with grotesque faces as lanterns. By those who made them, the lanterns were variously said to represent the spirits, or were used to ward off evil spirits. They were common in parts of Ireland and the Scottish Highlands in the 19th century, as well as in Somerset (see Punkie Night). In the 20th century they spread to other parts of England and became generally known as jack-o'-lanterns.
Quick background on me: I'm a leading admin on four different wikis (including Final Fantasy Wiki and Ratchet & Clank Wiki), and have been editing dozens of wikis for almost ten years now. As I'm a huge fan of Insomniac Games, and really excited for Marvel's Spider-Man on PS4, I decided to apply the skills I built over the years, along with my friend u/Jak_Himself (from the Jak and Daxter Wiki), to develop what will hopefully be the official wiki for the upcoming game!
The custom of guising at Halloween in North America is first recorded in 1911, where a newspaper in Kingston, Ontario reported children going "guising" around the neighborhood. In 19th century America, Halloween was often celebrated with costume parades and "licentious revelries". However, efforts were made to "domesticate" the festival to conform with Victorian era morality. Halloween was made into a private rather than public holiday, celebrations involving liquor and sensuality de-emphasized, and only children were expected to celebrate the festival. Early Halloween costumes emphasized the gothic nature of Halloween, and were aimed primarily at children. Costumes were also made at home, or using items (such as make-up) which could be purchased and utilized to create a costume. But in the 1930s, A.S. Fishbach, Ben Cooper, Inc., and other firms began mass-producing Halloween costumes for sale in stores as trick-or-treating became popular in North America. Halloween costumes are often designed to imitate supernatural and scary beings. Costumes are traditionally those of monsters such as vampires, werewolves, zombies, ghosts, skeletons, witches, goblins, trolls, devils, etc. or in more recent years such science fiction-inspired characters as aliens and superheroes. There are also costumes of pop culture figures like presidents, athletes, celebrities, or characters in film, television, literature, etc. Another popular trend is for women (and in some cases, men) to use Halloween as an excuse to wear sexy or revealing costumes, showing off more skin than would be socially acceptable otherwise. Young girls also often dress as entirely non-scary characters at Halloween, including princesses, fairies, angels, cute animals and flowers.