Yes, if you want people to be able to see the textures on you then you need to buy the items.
If you just want to see them for yourself, or want to take screenshots then you can do it this way.
Save it as a .tga without REL compression and name it head.tga, chest.tga, l_bicep.tga, or any other of the texture items*.
Make a folder in you custom folder, for example "Texture".
Put the head.tga in that custom folder.
Go ingame and type /lp 0 "Texture".
*To name it put a l_ or r_ if it's an item that has doubles, such as the bicep textures, then the name of the item.