Costume Dress (霊衣開放, Rēi Kaihō?), also known as Costume Change or Spiritual Costume Unlock, is the feature that lets any Servant (Providing that Servant has an alternate outfit unlockable) to switch their outfits, other than the 3 Battle Sprites unlocked from Ascension.
This was introduced since v1.25.0 with Mashu Kyrielight being the first Servant with an alternate outfit. Outfits you have obtained will stay in costume dress inventory until you cleared the conditions needed.
As of v1.33.0 the 
icon in the shop and event shops was replaced with a servants' portrait with a smaller costume dress icon to the left.
Alternate outfit/costume can be unlocked after a few conditions are cleared:
- Obtaining Costume Unlock Permit (霊衣開放権) by clearing designated quests.
- In some events you will have to clear the Final Main Quest for you to buy the costume in the event shops.
- Reaching a Level or Ascension Stage (varies among Servants).
- Having the required materials/items (varies among Servants).
Most of it will need
Costume List
| ID | Servant | Costume | Obtained by | Level Requirement | Material Requirements |
|---|---|---|---|---|---|
| 001 | 
| 常夏の水着 Swimsuit of Perpetual Summer | ビーチフラワー Beach Flower | Lvl 80/80 |  5
 5
 5
 5
 3M
|
| 002 | 
| 魅惑の獄長ルック Alluring Chief Warden Look | [高難易度] サイコーな監獄長 [High Difficulty] Psycho Chief Warden | Lvl 90/90 |  10
 5
 5
 5
3M
|
| 003 | 
| オリンピアの体操服 Olympian Bloomers | Lottery from Nero Festival Redux ~2017 Autumn~ | Lvl 80/80 |  10
 5
 5
 5
3M
|
| 004 | 
| 少女の捜し物 A Girl's Most Sought After | Da Vinci Shop | Lvl 80/80 |  10
 5
5
 5
3M
|
| 005 | 
| トゥリファスでの思い出 Memories of Trifas | Da Vinci Shop | Lvl 80/80 |  10
 5
 5
5
3M
|
| 006 | 
| 邪竜の魔女ver新宿1999 Wicked Dragon Witch ver. Shinjuku 1999 | Event shop from Da Vinci and The 7 Counterfeit Heroic Spirits Rerun Lite Ver | Lvl 90/90 |  10
 10
 5
5
3M
|
| 007 | 
| ホワイトローズ White Rose | Chaldea Boys Collection 2018 | Lvl 90/90 | 10
5
 5
5
3M
|
| 008 | 
| オルテナウス Ortenaus | Clear Arc 2: Chapter 21 | Lvl 80/80 | N/A |
| 009 | 
| モンテ･クリストセレクション Monte Cristo Selection | Servant Summer Festival! 2018 | Lvl 90/90 |  10
5
5
5
3M
|
| 010 | 
| エスタブリッシュメント Establishment | Servant Summer Festival! 2018 | Lvl 80/80 | 10
5
5
 5
3M
|
| 011 | 
| 夏の狩人 Summertime Hunter | Servant Summer Festival! 2018 | Lvl 70/70 | 10
5
 5
5
3M
|
| 012 | 
| 小悪魔たまご肌 (第二再臨) Little Devil's Egg-colored Skin [2nd Ascension] | Servant Summer Festival! 2018 | Lvl 90/90 |  10
 5
5
 5
3M
|
| 013 | 
| 小悪魔たまご肌 (第三再臨) Little Devil's Egg-colored Skin [3rd Ascension] | Servant Summer Festival! 2018 | Lvl 90/90 | 10
 5
5
5
3M
|
| 014 | 
| テクニコ・マスカラ Técnico Mascara | Christmas 2018 Event Exchange Shop | Lvl 80/80 | 5
5
5
 5
3M
|
| 015 | 
| ルーダ・マスカラ Rudos Mascara | Christmas 2018 - EX Match 8 | Lvl 80/80 | 10
10
5
5
3M
|
| 016 | 
| テスタメント･フォーム Testament Form | Prisma Causeway -Re-install- Exchange Shop | Lvl 90/90 | 10
 5
5
5
3M
|
| 017 | 
| グレイ・カラー Gray Collar | The Antiquated Spider Nostalgically Spins Its Thread Exchange Shop | Lvl 90/90 | 5
10
5
5
3M
|
