there is no official Mario costume, but check some online levels, I bet you can make one there.
this can be in little big planet and made in 2
in LBP2, you can search for it, then go to Creative. Click on it, go to the costume part, and then save the costume. You can also make it yourself.
The Sephiroth costume came out on July 13, 2011 for LittleBigPlanet 2.
It is a costume for Littlebigplanet 2 that you buy from the Playstation store for $1.99 or 5.99 as part of the LBP2 Final Fantasy VII Costume Pack.
It will not be out. The Final Fantasy Costume Pack and the Individual costumes are only for LittleBigPlanet 2
You cannot.
Thanksgiving
You have to ace the three Savannah levels to get the full costume
It is only out for LittleBigPlanet 2 both as a separate costume for $1.99 and part of the Final Fantasy costume pack for $5.99 at the Playstation Store
If there is a contest on, it will probably give you an option to submit your costume
buy it from the PS Store
You purchase it from the PSN Store.