It's named the Cap of Time, meaning the full set will be the Hero of Time's tunic. Basically every mainstream Hero's Clothes is most likely going to return.Here's some big ones I caught.
The green hat is back, the one without the yellow brim (Oot, WW, TP, etc.). It seems it can be worn with any armor.
The white pants are back too, they are called the Trousers of Time,it description subtly mention the Kokiri.
Though I haven't seen it yet, the green tunic is 99% likely back as well.