Yes, you are right. Thank youIf you're visiting a web site created to serve a group of people who dress up in costumes in order to play mythical creatures, you should not be surprised to see costumes available for sale as "costumes." It doesn't matter whether the costumes represent storm troopers from Star Wars, Klingons, King Kong or Lady Godiva.
- a complete style of dressing, including all the clothes, accessories, etc, worn at one time, as in a particular country or period; dress
- old-fashioned a woman's suit
- a set of clothes, esp unusual or period clothes, worn in a play by an actor or at a fancy dress ball: a jester's costume
Cosplay (コスプレ kosupure?), short for "costume play", is a type of performance art in which participants wear costumes andaccessories to represent a specific character or idea from a work of fiction. Cosplayers often interact to create a subculture centered onrole play. A broader use of the term cosplay applies to any costumed role play in venues apart from the stage, regardless of the cultural context.
Actually, I was thinking about armour as Loob has suggested, but I thought that "armour" is something that a knight once wore. I only asked about a costume, because this page had "costume" in description.I checked the main page of the link you provided, which states, "Cosplay Island is a social networking, portfolio and resource site for UK cosplayers."
I never heard of cosplay/cosplayer/cosplaying, so I looked it up on Wikipedia, and it says:
Cosplay (コスプレ kosupure?), short for "costume play", is a type of performance art in which participants wear costumes and accessories to represent a specific character or idea from a work of fiction.
So a person is playing the part of a Stormtrooper, and therefore the word "costume" is appropriate.
(This is context that is crucial for us to be able to answer questions properly; please be sure you provide it in the future.)