Elizabeth Bathory (Fate) in her Third Ascension outfit from Fate/Grand Order. It is a garish idol costume with a vertical-striped hat that has plush animals on top, a Blue Bow, and flowers lining the puffed-out dress. She wears this throughout the American Singularity storyline in FGO. An adapted version also shows up in the Joint Recital Craft Essence (Fate).
This is the outfit Elizabeth wears in the A Spear of an Aria, A Spear of a Clamor Craft Essence (Fate).