Cotton Calico
Calico fabric is a plain-woven textile, made from half-processed and unbleached cotton fibres. It's a coarse and rough fabric, but not as sturdy as denim or canvas, nor as fine as Muslin. Calico is generally very cheap due to it's unfinished nature, and the fact that it remains un-dyed and raw and still containing the cotton seeds.
Note : Calico will shrink about 10% on its first wash and around 2% / 3% thereafter.