To obtain a fiber material having a slight yarn collapse by cutting and a stable shape during wearing and keeping a silhouette and strength of suit.

The shape reinforcing correction fiber of double layer structure is obtained by powdering a metal having high thermal conductivity such as zinc or copper and uniformly mixing the powder with a molten nylon or polyester to form a core yarn. A suit using the same comprises a fiber being soft by heat of body temperature and the sun and readily moves. On the other hand, when the heat is cooled, the suit memorizes the shape and stabilizes the shape. Therefore, the suit has a new additional value for a use such as a business suit requiring much repeated movement.

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