Wikipedia entry Cosplay:

Cosplay (コスプレ, kosupure?), a portmanteau of the English words “costume” and “play”, is a Japanese subculture centered on dressing as characters from manga, anime, tokusatsu, and video games, and, less commonly, Japanese live action television shows, fantasy movies, Japanese pop music bands, Visual Kei, fantasy music stories (such as stories by the band Sound Horizon), and novels. However, in some circles, “cosplay” has been expanded to mean simply wearing a costume.In Japan, “cosplay” as a hobby is usually an end unto itself. Like-minded people gather to see others’ costumes, show off their own elaborate handmade creations, take lots of pictures, and possibly participate in best costume contests.

The most specific anecdote about the origin of the word “cosplay” was that Nov Takahashi (from a Japanese studio called Studio Hard) coined the term “cosplay” as a contraction of the English-language words “costume play” while she was attending the 1984 Los Angeles Science Fiction Worldcon. He was so impressed by the hall and masquerade costuming there that he reported about it frequently in Japanese science fiction magazines. This point is debatable, however, as the word fits in with a common Japanese method of abbreviation: combining the first two syllables of one word with the first two syllables of a second word (or, more precisely, the first two moras of each). Other examples of this include Pokémon (ポケモン, Pokémon? short for ポケットモンスター, or “Pocket Monsters”) and puroresu (プロレス, puroresu? short for プロレスリング, or “professional wrestling”)

Anyways, pixelninja has some redic cosplay pictures like the one above of Samas Aran. I was gonna be Samas for Halloween but I couldn’t fit in the cod-piece.
p.s. did you know many Japanese love hotels offer costume rental services?  Not to hate, but it’d def. be cool if my Mexican cleaning lady was wearing a anime costume as she cleaned up a debaucherous mess.