You can use the costumizer to exchange or remove outer garments. If you have on a purchased costume, use the item bag under "purchased items".
usaully there are special suits for everything on poptropica so hunt for an invisablitity suit.
get rid of the teens
You can't
maybe
You can't get rid of an item.
you cant
There are many hundreds of variations on the costumes on Poptropica. Some are available only throught the Poptropica Store or by playing ad-games on the site.
change your hair.
No you cant.
There is currently no exchange or return procedure at Poptropica.
Click on the models. Or use your phone.
you complete an island the go to the store. no real cash needed