A HS2/AIS accessory.
Check the latest version on the Release page and download it.
Drag and drop the .zipmod file into your game directory /mods/ folder.
In Chara Maker mode of your game, on the Accessory panel, add a slot and search for "blake", "fortune" or "flower" on the Chest tab, then add it to the slot.
You can also use MaterialEditor in Chara Maker to adjust its main and emissive colors as well as main and emissive textures.