The invention relates to a mannequin (1) for supporting a pair of trousers whereon a laser marking is performed, comprising two leg structures (2) to be housed inside the trouser legs. Each structure has a respective longitudinal axis (20), upper (21) and lower (22) areas, front (23) and rear (24) planes, an inner side (25) and outer side (26). The separation between the inner and outer sides varies by means of a tensing mechanism (3) so as to go from a non-operative loosened position (A) to a maximum tensed end position (B) in order to perform the marking. Each leg structure is coupled to a respective main rotation axis (5) about which it can rotate by means of a respective articulation (51) with which the mannequin (1) is equipped for each leg structure (2). The main rotation axis (5) is parallel to, or collinear with, the direction of the dimension of the rise of the pair of trousers. The front planes (23) can form at least two angles greater and/or less than 180° when they rotate around the respective main rotation axes (5) thereof.
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