you either buy it or get a member ship to buy special items.
no you can not.
in the store
The costume, like others at the Poptropica Store, has an effect built in, but will not change the play of any Poptropica island or game.
ther is n harry potter costume in poptropica, sorry. (it would be cool though!)
You Cant
You buy it at the poptropica store
I vampire meow
It is the fire man!!
any island
The jack'o'lantern is a costume, previously available in the Poptropica Store.
As of August 2014, there is no Pharaoh costume available without a top. The traditional costume is available through the Costume Closet.
You can't. It is a member's only costume.