The Fundoshi is a loincloth outfit you earn by resting at 18 Hot Springs in Ghost of Tsushima. It has one trick: running and sprinting make no noise, so you can rush up behind enemies for assassinations without crouching.
Visit hot springs around Tsushima and rest at each one. The outfit unlocks once you have used 18 of them.
It gives no protection, so treat it as a stealth or challenge outfit. Silent sprinting is great for chaining assassinations across a camp.
Archery Master's Attire
The Archery Master's Attire is Sensei Ishikawa's outfit, once a New Game+ armor set and now a dye for Tadayori's Armor. Its archery perks match a fully upgraded Tadayori's Armor, and you buy it from Baku the Voiceless with Ghost flowers.
Armor
Armor sets are the outfits Jin wears in Ghost of Tsushima, and the body piece is the only gear that changes how you play. Each set leans toward a style, such as archery, stealth, standoffs or tanking hits, so swapping sets is how you build for the fight ahead.
Broken Armor
The Broken Armor is the damaged samurai armor Jin wears through the Prologue after the Battle of Komoda Beach. It is the only set with no perks at all and it cannot be upgraded, so wear it only for the look or as a self-imposed challenge.
Deadly Rival's Attire
The Deadly Rival's Attire is Ryuzo's outfit, which Baku the Voiceless sells for 50 Ghost flowers in New Game+ only. It gives a massive health boost, major melee damage and stronger Ghost weapons, and it has no upgrades.