Two-part tags for attachment to a sheet form material (17), for example the cloth of a garment, are described. Each tag consists of a first part (1) adapted to carry a legend and having a substantially flat surface to lie against the sheet form material when the tag is used, and a perpendicularly projecting member projecting from the flat surface, and a second part (2) having a flat surface adapted to lie against the other side of the sheet form material when the tag is used, the second part including a receiving hole adapted to receive and hold the projecting member on the first part. The projecting member is a rod with a cone (4) on its end remote from the flat surface of the first part, the broadest part of the cone being of greater diameter than the remainder of the rod. The hole in the second part has a first section of diameter less than that of the wider end of the cone and a second section of diameter at least equal to that of the wider edge of the cone. The portion of the receiving hole in the second part adjacent the flat surface is elastically deformable to allow the passage of the cone, which may have a pointed end to pierce the material when the two parts are assembled, or a blunt end so that the rod which carries a deformed part of the sheet (17) through the hole. Tag application pliers are also described.L'invention porte sur des étiquettes en deux parties pour l'attachement à un matériau en forme de feuille (17), par exemple le tissu d'un vêtement. Chaque étiquette est constituée par une première partie (1) apte à porter une légende et ayant une surface sensiblement plate pour reposer contre le matériau en forme de feuille quand l'étiquette est utilisée, et un élément saillant perpendiculairement faisant saillie à partir de la surface plate, et une seconde partie (2) ayant une surface plate apte à reposer contre l'autre côté du matériau en forme de feuille quand l'étiquette est utilisée, la seconde partie comprenant un trou de réception apte à recevo
