This is a wearable shirt, sweater, or other top.
From the 2018 television anime "Last Period," here's a black cotton t-shirt with a full-color illustration of Zaku saying that she can't return to the swamp (Japanese text).
- [Garment Length]: 70cm
- [Garment Width]: 52cm
- [Shoulder Width]: 47cm
- [Sleeve Length]: 20cm