The idea it's actually not so bad as Ein really physically resemble a classic representation of Tarzan (he would need only longer hairs), however - as seen through the FB post of TN - in the intentions of the author that was a wild man full of scars, things that would make more cool the outfit if implemented.
I've to say that it's far from being the worst outfit for Ein in my opinion, but I would love if TN could decide to give him badass outfits and not only focused on the sexy aspect (simply because Ein was used to wear in that way in the past and fans would like to see it again).