If you want to replace those pre-made accessories came with the pre-made costume or make them yourself, this should be the suitable choice ! I made everything by inspect the game model really closely :D

3D model of the accessories on Rosanna: Chic Ocean from Goddess of Victory : NIKKEDesigned specifically for cosplayers.Includes separate parts:

• Bicep Device
• Strap add on
• Hair Clip
• Hair Clip WolfMolded in Blender and ZBrush (unit: meters).When converted to centimeters :
• Armstrap Big: 10.2 x 7.5 x 3.3 cm
• Armstrap Small: 4.3 x 1.7 x 0.9 cm
• Hairclip Small: 1.2 x 1.2 cm
• Hairclip Wolf: 4.5 x 0.6 x 0.25 cm

Test printed in resin, resulting in smooth detail and easy post-processing. Perfect as a lightweight headpiece, prop accessory, or display item. Ready to paint and minor customizing for usable props.