Nothing at all, just the dyes used. Also, it depends ont tradtion, since it comes from ascetics in India wearing "saffron" which is actually a spice that gives off a yellow color. Depending on how long the fabric remains dyed, it can be light yellow to a very dark orange.
Orange Robes
just robes. no special name for them. BTW the color is saffron.
The dress and customs make no difference as long as your mind is Buddhist and you practice Buddhist teaching.
Buddhist monks traditionally wear saffron colored robes, which is a shade of orange.
Buddhist monks do wear special clothing - orange or red robes and shave their heads. Search 'Buddhist Monks' into Google Images.
They can really wear anything. Monks usually wear orange,black, of white robes.
they wear loose robes usually in orange or brown very much like a toga.
Buddhist monks from various traditions, such as Theravada and Mahayana, typically wear orange or saffron colored robes as a symbol of their monastic lifestyle and commitment to their spiritual practice. This tradition of wearing robes dates back to the time of the Buddha.
only practicing buddhists wear grey robes. the monks wear orange or yellow.
Buddhists don't get married they wear orange robes, meditate and sing chants
That depends on the region. For example, the Tibetan Buddhists wear orange and yellow. Just go to images.google.com and search for "buddhist monk" ;)
Buddhist nuns (bhikkhunis) wear robes (civara). The robes have different names in different countries and different schools of Buddhism.