Disclosed is a water vapor permeable upper body garment (10) having a front side and a back side, said upper body garment (10) having the configuration of a single shell garment formed by an outer shell laminate, said outer shell laminate formed at least partly by a stretchable functional laminate; said stretchable functional laminate comprising a first functional film layer and a first textile layer attached to the first functional film layer, said stretchable laminate having a stretch force at 20% elongation of less than 1 N per cm of width; said stretchable functional laminate covering at least an upper central portion on the back side (12) of the upper body garment (10).