Well, actually pretty simple.
You open up the open market, set the class restriction to thief, for the levels you put in 14 to 14 (in the case you are sure it was level 14 armor - if not chose a wider range for example 12 to 16) and type in the search field: glorious -and let it search.
If there is anything regarding this armor listed in the open market, it will find it. (and you can find out the full name of the item too btw)
If anything of it is in the open market, this search will for sure find it. If not, maybe try again the next day or later that day.
You can really find some old "treasures" by doing some market searchs.
And yeah, the good old Ellu in the hidden map. Believe it or not I sometimes go there just to see good old Ellu again.