Calm down, you two. No bickering in the threads.
While I do agree the idea of a Sheikah tunic is somewhat silly and borderlining on a fan idea that doesn't work well within the world, the idea of stealth-enhancing garb is not an inherently bad idea. We've had a number of items throughout the series (like the Magic Cape from ALttP) that come close without actually doing it, and it would fit in well with existing stealth mechanics as well as the concept of tunics and equipment being more interesting and giving you full abilities instead of simply making you impervious to some kind of element. That's what was awesome about Twilight Princess, with the Zora Armor.
I predicted that the game would have an expanded inventory system (thinking along the lines of OoT's equipment or TWW's spoils), and spoils have more or less been confirmed. Yet, at the same time, we know you will have a multitude of shields to choose from, so I expect an equipment screen like OoT or TP, and I would love it if you upgraded this equipment regularly, going from simple stuff like the Zora Tunic to the full Zora Armor which allows you to swim. I
really hope Nintendo does a lot with this.
.......Um...Link's not a Sheikah, though. He'd have no reason to wear the clothing. Besides, what would be the point? Thieving and spying in Zelda? That's just not Zelda. I'm sorry, but that would really be a terrible idea to be put in a Zelda game. Not trying to down on you, but it just wouldn't work. At all.
As already stated, stealth aspects are prevalent in the series, and while it's been confirmed in the Siren World, that doesn't disprove the possibility that it will occur in other places NOR that it would be a good idea. I don't think one can say it's a terrible idea. And besides, thieving and spying are good ideas. It would be nice to see a Zelda game where the stealth is something a little more than just sneaking by guards. Actual political reasons, for example, spying for information, or trying to steal something or someONE (Zelda?) away from the enemy.
Enhancing stealth abilities would be more like an RPG, which is not a Zelda aspect. Again, it just wouldn't work, and many fans would seriously freak on Nintendo if this were to happen.
You're forgetting Adventure of Link with its RPG elements. Or really, there's even the confirmed RPG stuff in Skyward Sword. Collecting spoilers (also in TWW) and changing equipment (also in OoT, TP, OoX, etc.) are all RPG elements as well. Furthermore, the idea of a Stamina Meter or Shield Durability are strongly reminiscent of Western RPGs like Diablo. Bottom line is Zelda
constantly borrows from RPGs, and did so from as early as the beginning of the series. RPG elements are not completely contrary to the series history nor its nature, and while I do agree fans would initially freak out, some added depth to the existing RPG traits would likely evolve from the fans freaking out to the fans loving it. OoX went pretty far with having stat-altering ring accessories, and I don't hear anyone complaining about those. Hell you even had to find them and identify them like loot in a Diablo-style RPG.