The product description says 100% linen, but I've never encountered linen like this before? Fabric is quite lightweight, a bit transparent and is a jacquard weave (see photo).
Given it is a wrap skirt, and there are a lot of sewn front pleats, you can probably get away with not wearing a petticoat? I was wearing black leggings underneath this and on the other photo, there does appear to be some darker patches...
Also, I am 161cm tall with a 72cm (±2cm, depending) waist but the M didn't seem t...