Can be unbleached or bleached. The weight of the fibers can vary and will determine the strength and weight of the final fabric. Generally an inexpensive fabric. Also a term used to denote a mock up costume. Generally very stiff and often used as an interlining in costumes.
Organdy is the stiffer of the two.
The pattern is distinctive and is a colorful, curved series of abstract figures. Originally from Paisley, Scotland. The term now is used most often to describe the pattern rather than a fabric. Originally from Egypt, it is sometimes referred to as Egyptian cotton. Noted for the length of the fibers which give it the strength, it also means that it can be spun into a fine fiber which gives a lovely soft quality in plain weaves, very desirable for men's shirts.