I'll give you steps.
1login
2wait for it to load
3when it is done loading click on the backpack (the little brown backpack on the bar that is on the top)
4wait for it to load
5when it is done loading click on a little bar at the top
6you will see a whole list of names of islands and a tab at the very top that says store items
7you click on the tab that says store items
8wait for it to load
9go and find the outfit you purchased from the poptropica store
10the end you found it
1login
2wait for it to load
3when it is done loading click on the backpack (the little brown backpack on the bar that is on the top)
4wait for it to load
5when it is done loading click on a little bar at the top
6you will see a whole list of names of islands and a tab at the very top that says store items
7you click on the tab that says store items
8wait for it to load
9go and find the outfit you purchased from the poptropica store
10the end you found it