There should be a booth somewhere close to your balloon to get one.
The only way to get a grass skirt on Poptropica is to ask the man on Shark Tooth Island. He is to the right of the Ancient Ruins and the left of Booga the shark.
the grass skirt guy after you get the medel on shark tooth island
To look native to the medicine person
you need grass skirt from guy selling them
you go to the far right and click on the hula skirt/ grass skirt stand to get one
the grass skirt
In Booga Bay
Lead him back to the grass skirt island and get the medal!
Oddly enough, it is strictly a decoration. (Unlike the grass skirt, which is required in the game.)
you have to wear the grass skirt
You wear a grass skirt from a stall
you go to the beach and get a grass skirt