The Zora helm is found at the bottom of Toto Lake, northeast of Zora’s Domain. Use magnesis to pull it up. As for the Zora Greaves, you’ll have to show Laflat a photo of a red-maned lynel as part of the Lynel Safari Side Quest. Once you do, you’ll obtain the last piece ...
Zora's Domain General Store (immediately) Lookout Landing General Store (after a while) Gerudo Town Cooking Ingredient Store (only available after completing the Gerudo sectionof Regional Phenomenon) Hateno Village General Store (immediately)