Even a casual search for Michael Jackson at the top Halloween costume websites shows that the pop king's digs are very popular this year. Most of the major styles are out of stock, and there's only 1 or 2 left at even the biggest stores.
Don't even think about finding a "Dangerous" costume in stores ... unless you're lucky. There hasn't been one made in years and the industry was caught unprepared for the demand.
Our company, Moon Costumes, sold out of one our pop star sequined glove styles and 2 kinds of black jheri curl wigs a month ago, and had to reorder from overseas manufacturers. Many other companies haven't been able to keep up with demand.
Some advice for those looking for the perfect Michael Jackson costume is to search on websites for "sequin jacket" and "pop star" or "pop king" costumes, rather than searching for "Michael Jackson".
For example:
http://www.mooncostumes.com/search/pop+star
http://www.halloweenexpress.com/advanced_search_result.php?keywords=pop+star
Many of the best looks are unlicensed and are not allowed to use the legend's name in their promotional materials.
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Moon Costumes sells Halloween costumes, masks, wigs, Halloween props and decorations, and designs custom theatrical, cosplay, hobbyist and mascot costumes. http://www.mooncostumes.com