

I THINK I might’ve found out what this “thing” on Filia’s shirt is!
I think it’s a waist cinching clip bc I saw someone on here asking the same question and people really couldn’t come up with an answer. But I’m certain it’s some sort of cinching clip because I actually wear waist cinchers irl, which you put on the back of your clothing and you pick up the fabric on both sides and you attach the clips to the fabric and it pulls on the fabric, giving it a tighter/more form fitting shape.
They come in many different colors and designs to match the material or the color of your shirt.
But I could also be wrong because her shirt is so small that it flares out towards the bottom so idk, but I think I’m somewhat correct.
Edit: I’m correct! I found online some of Filias reference/modelsheets and it’s referred to as “waist band type thing” so pretty much a waist cinching clip!