Is there a way to get the Gown of eternal Innocence set back? The quest was giving me a bug saying I had the items already and unable to proceed. So i thrw them away and the quest didnt give me them. Is there a store or something i can rebuy it from?

Please Help.
Thanks !
I didn't find the right solution from the internet.
References:
-http://forum.square-enix.com/ffxiv/threads/345230-Ties-that-bind-Threw-away-the-outfit-how-do-I-get-it-back
- Web Video Examples