革の鎧 / 皮の鎧 / かわのよろい [kawa no yoroi] or 'leather armor' in Japanese.
Final Fantasy I
Stats: DEF +4, EVA -8
Equip: ?
Buy: 40 gil (Sell: ? gil)
Shop: Cornelia, Pravoka
Description: Armor made of hardened leather
Final Fantasy II
Stats: DEF +2, EVA -6%
Equip: all
Obtain: ?
Description: Armor made of hardened leather
Final Fantasy III

Stats: DEF 3, MDEF 1, weight 0
Use: FRE, ONK, WAR, THF, WHM, BLM, RDM, MNK, KNT, RNG, GEO, SCH, DRG, BLB, EVO, VIK, BRD, DRK, SMN, DEV, MAG, SAG, NIN
Buy: 90 gil (sell: ? gil)
Shop: Ur
Type: Body
Final Fantasy V
Stats: DEF 1, MDEF 1, weight +2
Equip: all
Buy: 80 gil (Sell: 40 gil)
Shop: Tule
Obtain: initial equip
Final Fantasy VI
Stats: DEF 28, MDEF 19
Equip: Celes, Cyan, Edgar, Gau, Gogo, Locke, Mog, Relm, Setzer, Shadow, Strago, Terra
Obtain: ?
Description: Armor made of hardened leather
Other: レザーアーマー [leather armor] in Japanese, so is in fact another equip than the others listed on this page
Final Fantasy XII
Stats: DEF 6, STR +2
Buy: 500 gil (sell: 250 gil)
Final Fantasy Tactics
Stats: HP +10
Equip (job): Knight, Dragoon, Samurai, Dark Knight, Onion Knight
Equip (character): Squire (Ramza, ch2+), Fell Knight, Holy Knight, Game Hunter, Templar, Sky Pirate, Sword Saint, Divine Knight, Ark Knight
Equip (enemy): level 1
Buy: 200 gil (sell: 100 gil)
Shop: (available after Eagrose Castle in ch1) Lesalia, Castles
Description: Armor made from layers of tanned leather.
Other: other jobs can equip with Equip Heavy Armor
Record Keeper

Leather Armor (III)
Stats: DEF +5, MDEF +2, EVA 93 (lv1), ? (lv3), ? (lv5), DEF +25, MDEF +11, EVA 93 (lv10)
Max Level: lv3 (initial), lv5 (first evolve), lv10 (second evolve)
Type: Armor, Rarity: ★

Leather Armor (VI)
Stats: DEF +5, MDEF +2, EVA 93 (lv1), ? (lv3), ? (lv5), DEF +26, MDEF +11, EVA 93 (lv10)
Max Level: lv3 (initial), lv5 (first evolve), lv10 (second evolve)
Type: Armor, Rarity: ★
Other: レザーアーマー [leather armor] in Japanese
Category: Equipment