A garment comprising: a front sleeve portion; a front body portion in continuous with the front sleeve portion such that the front sleeve portion is extended diagonally upward; a back sleeve portion; a back body portion in continuous with the back sleeve portion such that the back sleeve portion is extended diagonally upward; a side portion stitched to a side edge of the front body portion and a side edge of the back body portion; a lower sleeve portion that is in continuous with an upper end of the side portion and is stitched to a lower edge of the front sleeve portion and a lower edge of the back sleeve portion; an upper sleeve portion; and a shoulder portion in continuous with the upper sleeve portion; characterised in that: the lower sleeve portion is composed of a lower sleeve front portion that is in continuous with the upper end of the side portion and is stitched to the lower edge of the front sleeve portion, and a lower sleeve back portion that is in continuous with the upper end of the side portion and is stitched to the lower edge of the back sleeve portion, the lower sleeve back portion being cut separately from the lower sleeve front portion; the lower sleeve front portion is formed to be arcuate forward at an angle having an angle range of greater than 0 degrees and not more than 20 degrees with respect to a longitudinal direction of the side portion; the lower sleeve back portion is formed to be bent forward near an armpit reference line, which is a line connecting a front armpit point and a back armpit point, at an angle having an angle range of not less than 20 degrees and not more than 40 degrees with respect to the longitudinal direction of the side portion; and before the lower sleeve front portion and the lower sleeve back portion are stitched to each other, the lower sleeve front portion and the lower sleeve back portion intersect with each other. a front sleeve portion; a front body portion in continuous with the front sleeve portion such that the front sleeve portion is extended diagonally upward; a back sleeve portion; a back body portion in continuous with the back sleeve portion such that the back sleeve portion is extended diagonally upward; a side portion stitched to a side edge of the front body portion and a side edge of the back body portion; a lower sleeve portion that is in continuous with an upper end of the side portion and is stitched to a lower edge of the front sleeve portion and a lower edge of the back sleeve portion; an upper sleeve portion; and a shoulder portion in continuous with the upper sleeve portion; characterised in that: the lower sleeve portion is composed of a lower sleeve front portion that is in continuous with the upper end of the side portion and is stitched to the lower edge of the front sleeve portion, and a lower sleeve back portion that is in continuous with the upper end of the side portion and is stitched to the lower edge of the back sleeve portion, the lower sleeve back portion being cut separately from the lower sleeve front portion; the lower sleeve front portion is formed to be arcuate forward at an angle having an angle range of greater than 0 degrees and not more than 20 degrees with respect to a longitudinal direction of the side portion; the lower sleeve back portion is formed to be bent forward near an armpit reference line, which is a line connecting a front armpit point and a back armpit point, at an angle having an angle range of not less than 20 degrees and not more than 40 degrees with respect to the longitudinal direction of the side portion; and before the lower sleeve front portion and the lower sleeve back portion are stitched to each other, the lower sleeve front portion and the lower sleeve back portion intersect with each other. the lower sleeve portion is composed of a lower sleeve front portion that is in continuous with the upper end of the side portion and is stitched to the lower edge of the front sleeve portion, and a lower sleeve back portion that is in continuous with the upper end of the side portion and is stitched to the lower edge of the back sleeve portion, the lower sleeve back portion being cut separately from the lower sleeve front portion; the lower sleeve front portion is formed to be arcuate forward at an angle having an angle range of greater than 0 degrees and not more than 20 degrees with respect to a longitudinal direction of the side portion; the lower sleeve back portion is formed to be bent forward near an armpit reference line, which is a line connecting a front armpit point and a back armpit point, at an angle having an angle range of not less than 20 degrees and not more than 40 degrees with respect to the longitudinal direction of the side portion; and before the lower sleeve front portion and the lower sleeve back portion are stitched to each other, the lower sleeve front portion and the lower sleeve back portion intersect with each other.