The Discipline of a Buddhist monk is refined and is intended to be conducive to the arising of mindfulness and wisdom.
Monks and nuns take their vows for a lifetime. A monk can give bhikkhu vows back and return to home living, take the vows again later, he can take them up to three times or seven times in one life
A monk is allowed to collect, receive and consume food only between dawn and midday.
A monk must have all eatables and drinkables, except plain water, formally offered into his hands or placed on something in direct contact with his hands.
The special dress of ordained people, the robes, comes from the idea of wearing cheap clothes just to protect the body from weather and climate. They shall not be made from one piece of cloth, but mended together from several pieces.
Since dark red was the cheapest colour in Kashmir, the Tibetan tradition has red robes. In the south, yellow played the same role.