Isn't it just a sidebelt/accessory? (maybe a skirt strap?) IDK if it's a proper name but probably an artist choice/design b/c idk how many actual outfits have 'belts' like that. Other than making it yourself outta sewing fabric or so, it seems like the type that'd come attach with the skirt if you searched for a Miku cosplay tho I dont think every miku cosplay comes with it.
https://www.amazon.com/MILICA-BOOKS-Vocaloid-Hatsune-Cosplay/dp/B07FC64GJL These seems to have the belt attached but you'd need to buy it as a whole.
Item | Current | Lowest | Reviews |
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MILICA BOOKS Vocaloid Hatsune Miku Cosplay Costume | - | - | 3.7/5.0 |
^Item Info | Bot Info | Trigger