rei_no_himo

"That ribbon" or "you-know-what ribbon". A ribbon worn around the chest area and tied to the upper arms by Hestia (danmachi) from dungeon ni deai wo motomeru no wa machigatteiru darou ka, so named because one look at where it's tied, and what it's holding up, is usually enough to determine its purpose (breast support). Can also refer to any similarly-styled ribbon used in parodies and crossovers.