There are a total of 84 obtainable costumes. These should not be confused with disguises, which use an equipment slot. They are purely cosmetic and wearing them will not affect your current equipment's stats.
Costumes can be categorized into three types: costumes, skins, and polymorphs. Regular costumes change the appearance of your clothing, hiding your equipped items. Skins change the base appearance of your character, but don't hide your equipped items. Polymorphs change your entire appearance, usually by changing your character's race.
All costumes are bound to your account and cannot be traded to other players.
"Brilliance" Brocade Robes
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"Brilliance" Brocade Robes costume. Sold in the Crown Store for 1000 
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"Eternity" Tunic with Pants
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"Eternity" Tunic with Pants costume. Sold in the Crown Store for 500 .
"Song of the Night" Ensemble
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A female Redguard outfit, available in the Crown Store for 1000 .
Ashlander Kagesh Tribe Armor
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Part of Ashlander Pack which is sold in the Crown Store for 700 .
Ashlander Mabrigash Hunt Clothes
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Part of Ashlander Pack which is sold in the Crown Store for 700 .
Ashlander Mabrigash Travel Wear
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Part of Ashlander Pack which is sold in the Crown Store for 700 .
Battlemage Palatine Armor
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Part of Imperial Battlemage Pack which is sold in the Crown Store for 700 .
Battlemage Scout Captain Uniform
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Part of Imperial Battlemage Pack which is sold in the Crown Store for 700 .
Battlemage Tribune Armor
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Part of Imperial Battlemage Pack which is sold in the Crown Store for 700 .
Black Marsh Keeper
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An Argonian shaman costume. Part of Tribal Shamans Pack which is sold in the Crown Store for 700 .
Blacksmith
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A blacksmith costume, originally sold in the Crown Store for 400 .
Cadwell's Helm of Heroism
Received by completing Cadwell's Gold.
[[File:{{{icon}}}|{{{iconSize}}}|right|Appears only with Orsinium]]
Cavalier of the Sworn Oath
Acquired by completing the quest A Cold Wind from the Mountain.
Centurion Dress Armor
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Part of Imperial Officer Pack which is sold in the Crown Store for 700 .
Centurion Field Armor
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Part of Imperial Officer Pack which is sold in the Crown Store for 700 .
Chef
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A chef costume, originally sold in the Crown Store for 400 .
Classic Ordinator Armor
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Part of Ordinator Armor Pack which is sold in the Crown Store for 1000 .
Corseted Riding Outfit
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Corseted Riding Outfit costume. Sold in the Crown Store for 500 .
Covenant Scout
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A bandit-style costume. Part of Stealthy Rogues Pack which is sold in the Crown Store for 700 .
Crafty Lerisa's Thief Outfit
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A bandit-style costume. Part of Stealthy Rogues Pack which is sold in the Crown Store for 700 .
Dark Seducer
The Dark Seducer Costume is received by in-game mail when a character reaches Veteran Rank
6. You originally needed to be Level 50 to equip it.
Dominion Scout
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A scouting costume. Part of Woodland Scouts Pack which is sold in the Crown Store for 700 .
Draugr Polymorph
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A draugr costume. Sold in the Crown Store for 1,000 .
Dro-m'Athra's Skin
Acquired by completing Maw of Lorkhaj.
East Skyrim Scout Outfit
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Part of Winter Scouts Pack which is sold in the Crown Store for 700 .
Emperor's Regalia
The Emperor's Regalia is received by in-game mail upon becoming Emperor.
Evening Dress
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Evening Dress costume. Sold in the Crown Store for 700 .
Golden Saint
The Golden Saint Costume is received by in-game mail when a character reaches Veteran Rank 2.
Hand of Almalexia Uniform
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Part of Ordinator Armor Pack which is sold in the Crown Store for 1000 .
High-Collared Coin Ball Gown
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High-Collared Coin Ball Gown costume. Sold in the Crown Store for 1000 .
Imperial Chancellor
The is received by in-game mail when a character reaches Veteran Rank 16.
Imperial Guard Centurion Uniform
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Part of Imperial Officer Pack which is sold in the Crown Store for 700 .
Jaqspur
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A scouting costume. Part of Woodland Scouts Pack which is sold in the Crown Store for 700 .
Knight of the Flame
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A Breton knight costume. Part of Armored Knights Pack which is sold in the Crown Store for 700 .
Lion Guard Elite
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A Breton knight costume. Part of Armored Knights Pack which is sold in the Crown Store for 700 .
Lion Guard Knight
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A Breton knight costume. Part of Armored Knights Pack which is sold in the Crown Store for 700 .
[[File:{{{icon}}}|{{{iconSize}}}|right|Appears only with Orsinium]]
Maelstrom Baron Polymorph
Acquired by completing Maelstrom Arena in Veteran Mode.
Mages Guild Formal Robes
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Part of Mages Guild Pack which is sold in the Crown Store for 700 .
Mages Guild Leggings Uniform
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Part of Mages Guild Pack which is sold in the Crown Store for 700 .
Mages Guild Research Robes
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Part of Mages Guild Pack which is sold in the Crown Store for 700 .
Mannimarco
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The Mannimarco Costume is received by in-game mail when a character reaches Veteran Rank 10. You originally needed to be Level 50 to equip it.
Mask of Cheerful Slaughter
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A jester costume inspired by Sheogorath, with a mask that looks like the door to the Shivering Isles. It was given as a reward for having paid for a subscription for nine months.
Merchant Lord's Formal Regalia
Acquired by completing the quest "Forever Hold Your Peace" in the Thieves Guild questline.
Mind-Shriven Skin
Sold in the Crown Store for 1200 .
Naryu's Assassin's Armor
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A bandit-style costume. Part of Stealthy Rogues Pack which is sold in the Crown Store for 700 .
Nedic Duraki Armor
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Part of Nedic Pack which is sold in the Crown Store for 700 .
Nedic Keptu Armor
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Part of Nedic Pack which is sold in the Crown Store for 700 .
Nedic Perena Armor
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Part of Nedic Pack which is sold in the Crown Store for 700 .
Noble Dress
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Sold in the Crown Store for 700 .
Noble Suit
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Sold in the Crown Store for 700 .
Nord Hero Armor
Nord Hero Armor costume will be available from the Crown Store.
Off-the-Shoulder Evening Dress
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Off-the-Shoulder Evening Dress costume. Sold in the Crown Store for 700 .
[[File:{{{icon}}}|{{{iconSize}}}|right|Appears only with Orsinium]]
Old Orsinium Sentry
Acquired by completing the quest A Cold Wind from the Mountain.
Orcish Scout Armor
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Part of Winter Scouts Pack which is sold in the Crown Store for 700 .
Ordinator Night-Raid Armor
Part of Ordinator Armor Pack which is sold in the Crown Store for 1000 .
Pirate First Mate's Outfit
Part of Pirate Costume Pack which is sold in the Crown Store for 700 .
Pirate Sash and Bandolier Garb
Part of Pirate Costume Pack which is sold in the Crown Store for 700 .
Pirate Swab Outfit
Part of Pirate Costume Pack which is sold in the Crown Store for 700 .
Pumpkin Spectre Polymorph
A Pumpkin Spectre polymorph. Sold in the Crown Store for 1,200 .
Regalia of the Orsimer King
Acquired by completing the main story in Orsinium.
Royal Court Jester
A jester costume with a grinning white mask. Sold in the Crown Store for 700 .
Sand-Kissed Salwar Ensemble
Sold in the Crown Store for 500 .
Scarecrow Spectre Polymorph
A Scarecrow Spectre polymorph. Sold in the Crown Store for 1,200 .
Skeleton Polymorph
This costume is received as a reward for completing The Bargain's End quest in Shadowfen.
Before the Collections menu came out with Update 6, there were originally 3 different versions of the Gemstone of Skeletal Visage inventory item, each with a different level requirement depending on your alliance.
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Ebonheart Pact players who completed this quest would have obtained a Level 25 Gemstone of Skeletal Visage.
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Aldmeri Dominion players who completed this quest would have obtained a Veteran Rank 3 Gemstone of Skeletal Visage.
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Daggerfall Covenant players who completed this quest would have obtained a Veteran Rank 8 Gemstone of Skeletal Visage.
Soul-Shriven Armor Outfit
Part of Soul Shriven Pack which is sold in the Crown Store for 700 .
Soul-Shriven Leather Outfit
Part of Soul Shriven Pack which is sold in the Crown Store for 700 .
Soul-Shriven Ragged Clothing
Part of Soul Shriven Pack which is sold in the Crown Store for 700 .
Soul-Shriven Skin
The Soul-Shriven Skin is a Soul Shriven skin that can potentially be earned by completing the Barathrum Centrata event in the Imperial Sewers, as part of the Imperial City DLC. It is a very rare drop of the event's final boss, the Simulacrum of Molag Bal.
Summit Lord's Silken Robes
Summit Lord's Silken Robes costume. Sold in the Crown Store for 700 .
Tree-Minder
An Argonian shaman costume. Part of Tribal Shamans Pack which is sold in the Crown Store for 700 .
[[File:{{{icon}}}|{{{iconSize}}}|right|Appears only with Orsinium]]
Trinimac's Penitent Knight
Acquired by completing the quest A Cold Wind from the Mountain.
Valenwood Spinner
A Bosmeri spiritual leader costume. Part of Tribal Shamans Pack which is sold in the Crown Store for 700 .
[[File:{{{icon}}}|{{{iconSize}}}|right|Appears only with Orsinium]]
Vosh Rakh Ceremonial Mask
Acquired by completing the quest The Anger of a King.
Wedding Dress
A wedding dress costume, intended for the Ritual of Mara. Sold in the Crown Store for 700 .
Wedding Suit
Sold in the Crown Store for 700 .
West Skyrim Scout Outfit
Part of Winter Scouts Pack which is sold in the Crown Store for 700 .
Whisperweft Gala Wear
A female Redguard outfit, available in the Crown Store for 700 . The item was originally mistakenly announced as the "Song of the Night" Ensemble.
Winterborn Hunter's Costume
Part of Winterborn Reach Costume Pack which is sold in the Crown Store for 700 .
Winterborn Shaman Costume
Part of Winterborn Reach Costume Pack which is sold in the Crown Store for 700 .
Winterborn Warrior's Costume
Part of Winterborn Reach Costume Pack which is sold in the Crown Store for 700 .
Wood Elf Vanguard
A scouting costume. Part of Woodland Scouts Pack which is sold in the Crown Store for 700 .
Xivkyn Augur Polymorph
Very rarely found in Imperial Reward containers, purchasable from Tel Var Lockbox/Greater Lockbox merchants.
Xivkyn Dreadguard Polymorph
Very rarely found in Imperial Reward containers, purchasable from Tel Var Lockbox/Greater Lockbox merchants.
Xivkyn Tormentor Polymorph
Very rarely found in Imperial Reward containers, purchasable from Tel Var Lockbox/Greater Lockbox merchants.