A functional jacket is provided to be able to be put on regardless of the changing trends in fashion by adjusting the size of a collar optionally and the number of buttons attached to the jacket. A functional jacket includes sleeve portions(40), shoulder portions(60), pocket portions(80), collars(100), sleeve button portions(120), front button portions(140), button slits(160) and a collar folding portion(200). The sizes of the collars and the collar folding portion are adjusted. The number of the buttons on the front button portion that is attached to the front surface portion of the jacket is able to be adjusted. A slit intercepting member(180) is attached to the button slit. Any one member selected among a Velcro, a magnet, a button, a screw, a bolt pin, a button clip and a tape is attached to the inner cloth of the collar.
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