To get both colorways, you just need to choose one option. Afterwards, when you're already transported to your new crib wearing the new ghost armor dye, immediately abandon the mission. You'll be back to the start of Tale of Lord Shimura WITH the unlocked dye available already.
You can just then choose the other option to get both afterwards. After the credits roll, Jin will be at the hideout received from the ending you picked this time, but now he has the Ghost Armor dyes from both endings. After completing Eternal Blue Sky, head to Omi Village to commence The Tale of Lord Shimura.
The only rewards for either ending are a new set of dyes for your Ghost armor, granting you a new look in either ending. If you killed Shimura, you'll get the "Righteous Punishment" white coloration for your armor, as well as the Ghost mask and headband. Spare or Kill Lord Shimura Rewards The only rewards for either ending are a new set of dyes for your Ghost armor, granting you a new look in either ending.
Unfortunately like Apex said its presently impossible to get 'both' Ghost Armor dyes for the ending. With Sucker Punch updating the game and continuing to add to it, both with single player difficulties and the like as well as the multiplayer component to be introduced later on however? Spare Lord Shimura for a Special Ending Reward An alternate way to unlock the Ghost Armor's white dye is by choosing to spare Lord Shimura during Jin's climactic duel at the end of the game. Selecting this redemption ending will grant you a special version of the white dye only accessible in New Game+ playthroughs.
It's been a while since I tested it, but from memory - after you make the final decision, let the credits roll and you will spawn at either Dawn Refuge or Traditions End. Before you go outside (which triggers the cutscene with Yuna), save and reload - you spawn in with the armour dye from the ending you chose but the mission will still be available as if you haven't started it yet. You can.
By completing the Spare Lord Shimura ending, players will acquire the Vow of Vengeance dye color to be used for the Ghost Armor. They will also find Jin's new home located at Tradition's End. What are the rewards for the ending of Ghost of Tsushima? For completing the Kill Lord Shimura ending, players will receive the Righteous Punishment dye color for the Ghost Armor set, as well as the Dawn Refuge home for Jin Sakai.
Check out this armor guide about the Ghost Armor in Ghost of Tsushima! Find out how to get this armour, its location, dyes, colors, effect, stats, guides and more!