The Zen tradition has three major, very simple, forms: bowing, chanting and sitting in meditation. Zen is keeping this “don’t know” mind always and everywhere. Bowing means body and mind become one very quickly, Chanting is humming and singing in meditation, mantra. Zen clothing is feel good clothing, amazing to wear and soft on the skin.
Dark comfortable clothing is most appropriate, no shoes ands socks in the dojo. Some people wear a kimono, which is warm and comfortable and is oversized for the movements. The clothing is mostly black.