To provide a combined filament yarn capable of exhibiting natural old clothes appearance and naturalness of color fading, which are characteristics of a denim-like product, a dungaree shirt or the like, providing both of soft feeling, and body and stiff feeling, and composed of a polyester fiber; to provide a woven or knitted fabric, and a sewed product having the old clothes appearance.

The air-combined filament yarn is obtained by using a polyester multifilament (A) constituted of a sheath-core type conjugate fiber the sheath part and the core part of which are formed out of two polyesters having mutually different dye-affinities, and a polyester multifilament (B) composed of a polyester having the same dye affinity as the one of the polyester constituting the sheath part, and having a shrinkage in hot water larger than that of the polyester multifilament (A). The sewed product is made of a woven or knitted fabric including the combined yarn, and subjected to a caustic reduction processing.

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