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you can buy a cosplay costume online or you can make a costume yourself. There are also many places where you and other people can cosplay known as cosplay events.
From Kingdom Hearts? Go to the cosplay store in the links. Do a search for the costume or ask them to make it custom.
You can wear anything you'd like. If you can't buy a Cosplay costume make your own costume with whatever you have and try to make it look similar to a Anime TV show you like.
I choose my favourite character first.Then prepare a suitable outfit for my character.At last,make up to match my cosplay costume.
If your talking Ryuuku or any other shinigami, you would have to go to a cosplay shop, and possibly consult an online cosplay site such as Cosplay.com to learn the tricks to making the costume. If your talking about any of the human characters, there clothes are normal and can be bought at any convenient store.
You can make your own costumes cheaply. For example check out carboncostume.com.
That all depends on who is making them, and what the character wears. However, I always recommend making cosplay outfits out of materials that you would use for every day clothes. Avoid using materials like overly shiny and cheap costume satin. If you make your cosplay as you would if you were to wear it every day, it will end up looking more realistic, and less costumy.
You can try cosplaytrader.comTry cosplaymagic.com ~ see the related link below .Try carboncostume.com to make your own costumes.Try trustedeal.com/Wholesale-Cosplay-Costumes_c15.html
Many cosplay sites take "commissions" which means they will make you anything you want. Your costume will look amazing, but it won't be cheap! you can try online cospay store your-cosplay.com
Cosplay is basically dressing up as your favorite character. So, make up a character and create the costume for it. Who knows..maybe it'll catch on you can try online cospay store your-cosplay.com
Cosplay Station (dot) ca will make them on commission, but they are very expensive, around $225.000. You might be able to find a dealer at a CosPlay convention who has them, or do an internet search. Most people make their own costumes.
here is a costume, hope this could be helpful:http://www.theinnest.com/sasuke-third-generation-cosplay-costume-p592.html