The circus bear costume is a reward from the Open Season movie ad-game on Poptropica. It appeared on the site in mid-January 2011 in connection with the release of the DVD of Open Season 3 (January 25, 2011).
(see the related question)
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
where do you enter your naughty bear free costume
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.
Go to the right of the Daily Paper then enter and go to the top. You can choose between a bear or deer costume from Open Season 2.