The Tropical headdress is part of the Tropical Islander Outfit that could be purchased from Solomon's General Store. As of 3 September, 2013, it was made available for loyalty points. They have a different appearance for males and females and may be recoloured in the shop interface - the grass is not recoloured though, only the headband.
The outfit was available for free to members throughout the duration of Sizzling Summer, as a promotional item and as a bonus for being a member during the duration of Sizzling Summer. It was later obtainable by purchasing through the Solomon's General Store.
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A male player wearing the Tropical Islander Outfit
A female character wearing the Tropical Islander Outfit