Comfy two-piece set - black

How relaxed is this 2-piece comfy set? The top has a shirred bottom that falls just above the waistband.

The length of the trousers is quite long. Can be worn up to 1.75m.

Sizes: Onesize, can be worn from size XS to XL.

Fabric composition: 50% viscose, 45% polyester & 5% elastane.

Washing instructions: 30 degrees.

Model is 1.67m, and wears size Onesize.