It appears that the attire is only proc'ing on my weapon enchant damage. Others have confirmed that if you remove everything that proc's, the attire will proc on the single hit with the correct %, however once you have multiple things that proc it either randomly picks one or defaults to weapon damage. I believe this should be proc'ing on everything? Here are two screenshots, one with a critical strike on a dummy, and one with a regular strike on a mob.
Crit on SH dummy:
Regular strike on mob:
In both instances it only procs on my feytouch damage. I'm on XBOX, not sure if PC is seeing the same sort of results. Also I'm an HR.
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Screenshots: http://imgur.com/a/jmU1b