fig1 and 16a and this prevents any twisting and or rotation relative to the aforementioned body 1 with the subsequent horizontal sliding along the body 1 the sizer 20 slides along the hook 2 and snaps into the tab 5 which crosses the channel shaped groove 4 fig1 and 17a in such a final position the boss 24 is contained inside the channel shaped groove 4 and its upper surface is positioned below the lower wall 5 1 of the tab 5 of the hook in this way the sizer 10 can no longer slide due to the presence of the tab 5 which blocks the sizer 20 from above and due to the channel shaped groove 4 which blocks the sizer 20 sideways referring to fig1 in another embodiment the sizer 30 sizer is constructed so as to be slid onto a hook of a hanger and blocked in place as in the first embodiment or to be slid onto a hook of a hanger and laterally moved into place as in the second embodiment as illustrated the sizer 30 is made up of a peripheral wall defined by two preferably trapezium shaped longitudinal walls 31 and made up of two rectangle shaped.