Why are bathrobes and kimonos so expensive in Japan?

Maybe it's because the materials are expensive. It seems that the formal kimono material is special silk, which is very expensive in itself (some materials are smudged and have too many colors up and down). Special patterns may be embroidered by hand), and the width is generally 70, so the cost of making a set is higher than that of ordinary cloth. Coupled with high production costs, prices naturally go up. If you want to spell out a complete pattern on clothes, it takes a lot of materials and time to make it.