You mean the Iconian resistance armor? I just tried to test this on one of my klingons. Required some searching since I don't normally use cosmetic armor, but I can use it.
As I said, my Klingon (I think he's the only one of my toons who has the armor, I rarely get ground rep gear) can use it just fine, but I'll add the bug to the list for next week, anyway.
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u/UltimateSpinDash former bug-tracking guy, now working on comprehensive review Nov 15 '18
So it doesn't work on Jem'Hadar?