I'm not sure if this is a bug or if certain costumes/outfits are not available for Hashashin yet, but the Desert Ghillie cannot be opened on Hashashin.  It states that the costume is not available for the class, even though the pearl shop displays Hashashin wearing the Ghillie with the distinction "[Hashashin] Desert Camoflauge".  What's also weird is that according to a guild member the Forest Ghillie can be opened by Hashashin.  

Wondering if anyone has any insight as to if this is a known issue, or if I can hang on to the Desert Ghillie Box and open it with Hashashin at a later date, or if I should request a refund, etc. 

Any insight would be appreciated!