One day when Fa-yen Wen-i (885-958), one of the well known Chinese Ch'an masters, has ascended his seat. From the assembly, a monk came out and asked:
-What is one drop of water from the fount of Tsao-ch'i?
ZAZEN MEDITATION GUIDE - Chapter 5. Garments for Sitting
Garments for Sitting You will not be comfortable with any kind of tight, heavy or hard fabric clothing when you sit in zazen. Therefore, any loose fitting garment made of fine, soft fabrics will be better in sitting. When you do zazen, wearing garment is much better than wearing nothing.