A garment for sport activities prevailingly made of substantially inextensible materials comprises additional flaps (140) of extensible elastic materials supplementing the conventional stretchable inserts (130). When the wearer of the garment is of anormal anatomic typology, the supplementary flaps (140) are concealed inside the garment but are adapted to be freely exposed on the garment outer surface by a manual actuation of zippers (135) in case of a different anatomic typology. Each additional flap (140) is attached at a first lateral side (136) to an insert (130) and at the opposite lateral side (137) to a zone of the garment which is made of substantially inextensible materials. Thus, the garment fits adequately and comfortably to the wearer's body also in correspondence of parts of the body which can be of various shapes and/or dimensions.