well, you can upgrade it once, randomly, using a blessing of goddess, where you cant trade,sell or drop, i believe, unless you get the blessing removed.
Quote:
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Can be used on any Premium Shop Suit and any Cloak, including guild cloaks.
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direct from flyff wiki:
http://flyff-wiki.gpotato.com/index....ing_of_Goddess
pretty expensive though, imo, and guild cloaks are useless