In order to make the hardened Tae Ew hide, you need to combine a Flawless Tae Ew hide and some Tae Ew blood, which is a trivial>250 combine as well...
So I wouldn't expect to see too many of these flooding the market anytime soon, if the drops are as rare as they supposedly are... hopefully my fellow tailors will realize their actual value vs. difficulty of making them and just sell them for 500-800p, which seems their approximate worth to people who couldn't afford/loot the better arms, that is..a 54 druid that can get Elysian armor would only see these as good for their resists (which aren't great), otherwise their not better than what I could get with a little patience.
DISCLAIMER: I've never been to the new CT (planning on it soon, maybe when I ding 55)...and I've never tried a combine. Going on this site's info alone. mixed with my experience getting to 130 in tailoring.,