The Volas Breastfeeding listing calls the fabric ultra-soft and breathable muslin. Photos show a loose, textured poncho.
No thread count, lining note or season rating is listed. Soft and breathable language is about wearing a layer, not a medical result. The photos look like an opaque garment on the model; sheerness is not discussed.
Read the Volas Breastfeeding cover listing and look at the shape before you choose a colour.