All 43 costumes of Katsuragi Lilja in-game, with their unlock conditions — taken from the publisher's own released data (Costume.yaml).
GO MY WAY!!
Obtained by pulling Katsuragi Lilja in the "White Line (白線)" gacha banner
Junk Road (ガラクタロード)
Obtained by pulling Katsuragi Lilja in the "Junk Road (ガラクタロード)" gacha banner
Junk Road (ガラクタロード)
Obtained when Katsuragi Lilja ("Junk Road (ガラクタロード)" version) reaches Talent Bloom stage 4
Heartbeat Emotion (ときめきエモーション)
Obtained by pulling Katsuragi Lilja in the "Heartbeat Emotion (ときめきエモーション)" gacha banner
Heartbeat Emotion (ときめきエモーション)
Obtained when Katsuragi Lilja ("Heartbeat Emotion (ときめきエモーション)" version) reaches Talent Bloom stage 4
ENDLESS DANCE
Obtained by pulling Katsuragi Lilja in the "White Line (白線)" gacha banner
Atmosphere
Obtained by pulling Katsuragi Lilja in the "Atmosphere" gacha banner
Atmosphere
Obtained when Katsuragi Lilja ("Atmosphere" version) reaches Talent Bloom stage 4
Let's Charge Forward! (がむしゃらに行こう！)
Obtained by pulling Katsuragi Lilja in the "White Line (白線)" gacha banner
Miracle Nanau! (ミラクルナナウ(ﾟ∀ﾟ)！)
Obtained by pulling Katsuragi Lilja in the "White Line (白線)" gacha banner
Howling over the World
Obtained by pulling Katsuragi Lilja in the "Howling over the World" gacha banner
Howling over the World
Obtained when Katsuragi Lilja ("Howling over the World" version) reaches Talent Bloom stage 4
A Piece of Cake, Anytime Anywhere (古今東西ちょちょいのちょい)
Obtained by pulling Katsuragi Lilja in the "White Line (白線)" gacha banner
Cherry Blossom Photograph (桜フォトグラフ)
Obtained by pulling Katsuragi Lilja in the "Cherry Blossom Photograph (桜フォトグラフ)" gacha banner
Aurora (極光)
Obtained by pulling Katsuragi Lilja in the "Aurora (極光)" gacha banner
Aurora (極光)
Obtained when Katsuragi Lilja ("Aurora (極光)" version) reaches Talent Bloom stage 4
As the Snow Melts (雪解けに)
Obtained by pulling Katsuragi Lilja in the "White Line (白線)" gacha banner
Happy Millefeuille (ハッピーミルフィーユ)
Obtained by pulling Katsuragi Lilja in the "White Line (白線)" gacha banner
Campus mode!!
Obtained by pulling Katsuragi Lilja in the "Campus mode!!" gacha banner
Campus mode!!
Obtained when Katsuragi Lilja ("Campus mode!!" version) reaches Talent Bloom stage 4
White Night! White Wish!
Obtained by pulling Katsuragi Lilja in the "White Night! White Wish!" gacha banner
White Night! White Wish!
Obtained when Katsuragi Lilja ("White Night! White Wish!" version) reaches Talent Bloom stage 4
Costume Rhapsody (仮装狂騒曲)
Obtained by pulling Katsuragi Lilja in the "White Line (白線)" gacha banner
Crowning Chrysanthemum (冠菊)
Obtained by pulling Katsuragi Lilja in the "Crowning Chrysanthemum (冠菊)" gacha banner
Crowning Chrysanthemum (冠菊)
Obtained when Katsuragi Lilja ("Crowning Chrysanthemum (冠菊)" version) reaches Talent Bloom stage 4
You and Semi-Blue (キミとセミブルー)
Obtained by pulling Katsuragi Lilja in the "White Line (白線)" gacha banner
White Line (白線)
Obtained by pulling Katsuragi Lilja in the "White Line (白線)" gacha banner
White Line (白線)
Obtained when Katsuragi Lilja ("White Line (白線)" version) reaches Talent Bloom stage 4
Beginning (初（はじめ）)
Owned from the start
Gleam of Gold (ゴールドの輝き)
Clear Stage 10 of Katsuragi Lilja's Path to Idol
Gleam of Platinum (プラチナの輝き)
Clear Stage 15 of Katsuragi Lilja's Path to Idol
Gleam of Jet Black (漆黒の輝き)
Clear Stage 25 of Katsuragi Lilja's Path to Idol
Favorite Casual Wear (お気に入りの私服)
Obtained as an event reward
Hatsuboshi Academy Uniform (初星学園制服)
Owned from the start
Lesson Wear (レッスンウェア)Training Outfit
Owned from the start
Lesson Wear (レッスンウェア)Training Outfit
Raise Katsuragi Lilja's Master Achievement to Rank 3
The Suit That Delivers a Shout (叫びを届けるスーツ)
Purchasable directly in the costume shop
Santa Cape (サンタケープ)
Purchasable directly in the costume shop
Festival Happi Coat (祭法被)
Purchasable directly in the costume shop
Sailor Swimsuit (セーラーミズギ)
Purchasable directly in the costume shop
Hatsuboshi Academy Gym Uniform (初星学園体操服)Training Outfit
Purchasable directly in the costume shop
Hot Spring Swimsuit (温泉用水着)
Purchasable directly in the costume shop
Child Smock (チャイルドスモック)
Purchasable via a costume bundle pack (or other means)
