There are two new outfits: The Risa Explorer Outfit and Risa Beach-comber Outfit. There is also a Lohlunant Flower Accent Pack which allows you to wear flowers (like Hawaian Leis) over your regular uniforms. These three sets are available via the Risa Summer Event and cost 600 Lohlunant Favors each. Finally, there are four new sunglasses (Octagon, Shield, Small Round, and Visor) that can be purchased at any GPL vendor for 10k GPL (40k for the set).
These unlocks are per character. You can also purchase (or sell) the Gift Boxes via the Exchange. Last I saw, the uniforms were going for about 10M EC, the glasses for about 100k each. I expect these prices to drop significantly as Favors flood the market.