The single-layer Keiko Gi is a thick jacket, made of 100% absorbent cotton in white.
The shoulder part of the gi is enforced with an additional layer.
You can wash both Hakama and Gi by hand in water at a very low temperature.
Tip: In order to keep the folds of the Hakama after washing it, just follow this procedure.
Before washing, fold the Hakama (see how here). Put it in the tub and wash it by trampling on it like traditional winepresses do. Once it is done, carefully open the folds and hang it on a line to dry. Take it off before it is completely dry and fold it back, then press it with books and leave it to dry. It will then look like perfectly ironed!
Find further tips at our Kendoinfothek:
Folding the Hakama: [more]
Putting on the Hakama: [more]
Folding the Gi: [more]