Well here's what I think; There should be a Tunic that represents every race of Hyrule.
Zora Tunic and Goron Tunic we already have, but they could be upgraded.
Zora Tunic: Breath, swim faster, and use all items underwater (unless they are fire-based)
Goron Tunic: Heavy Plated armor (resembling a Goron's body) that's heat, fire, and even bomb resistant. However the armor itself will give an "Iron Boots" effect.
Rito Tunic: Resistance of air currents
Minish Tunic: Large falling objects are resorted to 1/2 the damage.
Gerudo Tunic: Heat resistant and able to walk on quicksand (without sinking of course).
Shiekah Tunic: Maybe have something that looks like Shiek's attire. The Tunic will make you invisible in shadows.
Deku Tunic: Ummm Camoflauge(sp?) in any grassy/wooded area and snipe away?
Twili Tunic: You become a shadow, and you're only able to travel via shadows. So for example, if you're unable to get pass the soldiers guarding a gate, wait for someone who does have access to come through (you'll probably have a daily schedual planned like in
MM) and merge with their shadow).
All these "tunics" won't look the same (a simple T-shirt design). They'd be more intricut(sp?), and sorta reflect on the race.
Heck, if Tunics are slipping away, I wouldn't mind seeing the customization of Rings coming back (it was one of my favortie things in the Oracle games. Bring Vasu back!).
Sure there would be a lot of customization, but I wouldn't mind seeing some regular tunics too (you know, ones that are simply more resistant than the normal green tunic as seen in
ALttP).
-BGS