Note: this guide is currently under construction.
Heart Pin

Found in a chest in a sublevel near the end of the Suthorn Ruins dungeon.
Stone Anklet

Can be purchased in the Hyrule Castle Town shop for 400 rupees.
Gerudo Sandals

Can be purchased in the Gerudo Town shop for 400 rupees.
Energy Glove

Found in a chest that is unlocked by clearing the Boarblin camps in the northwest corner of Gerudo Desert.
Survey Scope

Given as a reward during the "Recipes, Please!" side quest after making 10 unique smoothie recipes.
Survey Binoculars

Given as a reward during the "Recipes, Please!" side quest after making 20 unique smoothie recipes. Replaces the Survey Scope equipment.
Zora's Flippers

Can be purchased in the River Zora Village shop for 350 rupees.
Zora Scale

Given as a reward for completing "The Zora Child's Fate" side quest in River Zora Village. It's available after completing the Jabul Ruins dungeon. You must show the mother of a Zora child a Tangler, Bombfish, and Biri echo to complete the quest.
Silver Brooch

Can be found in a chest to the west of the River Zora Village. Use a water block tower to get to the higher area west of town and use a Bombfish to blow up the cracked wall. There is a treasure chest in the new opening.
Frog Ring

Found in a chest next to the big key chest in the Hyrule Castle dungeon.
Charging Horn

Given as a reward for completing the long course flag race at Hyrule Ranch in less than 40 seconds.
Gold Brooch

Given as a reward for completing the "Secret Chief Talks" side quest for the chiefs assistants in Zora Cove.
Gold Sash

Given as a reward for completing the "Wild Sandstorms" side quest for the Gerudo Warriors in the Gerudo Palace barracks. It involves defeating a stronger Lanmola in eastern Gerudo Desert.
Silk Pajamas

Found in a chest at the end of the treasury in Gerudo Town. Obtained by sneaking past all the guards as part of the "Dohna's Challenge" side quest.
Heart Barrette

Given as a reward for completing the "Bettle Ballyhoo" side quest, which involves clearing out a cave full of Beetles for a Gerudo near the shop in Gerudo Town.
Cat Clothes

Given in exchange for the secret stash of treasure as part of the "Questioning the Local Cats" side quest in Kakariko Village.
Climbing Band

Can be purchased in the Kakariko Village shop for 500 rupees.
Fairy Flower

To the left of the southwestern Eldin Volcano Trail waypoint is a cave entrance that can be blown open with a bombfish. Inside is a chest containing the fairy flower.
Goron's Bracelet

Given as a reward for completing the "A Mountainous Mystery" side quest and traversing the Summit Cave to defeat the Flame Giant boss.
Customary Attire

Given as a reward for completing the "From the Heart" side quest by saving Romi from the rift in southern Hyrule Field.
Might Bell

Given as a reward for completing "The Great Fairy's Request" side quest.
Spin Brace

Found in a chest after defeating a Lv. 3 Darknut at the end of a cave in the ruin area on the east side of Faron Wetlands.
Fairy Fragrance

Given as a reward for completing the "Looking for Bempu" side quest in Faron Wetlands.
Curious Charm

Given as a reward by a Deku Scrub in Scrubton for completing the "Cotton-Candy Hunt" side quest, which involves defeating the boss of the Hidden Ruins mini-dungeon.
First Mastery

Given as a reward for completing four trainings in the Slumber Dojo in Kakariko Village.
Second Mastery

Given as a reward for completing eight trainings in the Slumber Dojo in Kakariko Village.
Clockwork Bangle

After having Dampe craft all the automatons, you can speak to him again and exchange five monster stones for this equipment.
Ice Spikes

Found in a cave in central Hebra Mountain. You can reach it by using a flying tile echo to the west from the top of the waterfall.
Stamp Suit

Given as a reward for completing the stamp rally and collecting all 25 stamps across Hyrule.