What is the photographic background of this picture of children's wear?

It should be to put the gray cotton cloth on a flat surface, on a table or on the floor. The fabric has no strong reflection and the color is not particularly light. It can be used as the background of white objects. The light is a little hard, playing sideways, but the children's clothes are not so complicated to splicing or something.

The background cloth is not necessarily a special material, but a common material with appropriate color, such as monochrome carpet and tablecloth.