You will need to buy a few things.
black wig
black long overcoat
black Cape(optional)
black pants
That is unknown.
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.
There is really no answer to this question. There are many powerful potions and Severus Snape is especially gifted at Potions. He could make any of them. Amortentia, a love potion, is said to be very dangerous.
Severus Snape was going to the third floor trapdoor to make sure Professor Quirrell was not able to go down and steal the philosopher's stone. Although, Harry and Ron thought that Snape himself was trying to steal the stone that night.
I choose my favourite character first.Then prepare a suitable outfit for my character.At last,make up to match my cosplay costume.
You can make your own costumes cheaply. For example check out carboncostume.com.
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
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
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 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.