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Ottoman is a fabric with a pronounced ribbed or corded effect, often made of silk or a mixture of cotton and other silk like yarns. It is mostly used for formal dress and in particular, legal dress (such as QC gowns) and academic dress (mostly for hoods).
Ottoman made of pure silk is very expensive so artificial silk is used instead to create a cheaper alternative.
Grosgrain is similar to Ottoman but it is thinner and lighter than Ottoman and is used mostly for ribbons.
Source of the article : Wikipedia
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