"T-shirts (other than of the underwear type) are knitted or crocheted garments of the vest type, not napped, nor of pile or terry fabric, in one or more colours, with or without pockets, with long or short close-fitting sleeves, without buttons or other fastenings, without collar, without opening in the neckline, having close-fitting or lower neckline (round, square, boat-shaped or v-shaped)."