Yes, if you buy the textures(art) you will need to buy the body textures(items) to wear them, if that's what you meant.
Either you go to your deactivated ( ), and press the 'edit' button next to the item, you can set a price you want to sell it for and someone might buy it. Or you go to the market forum ( ), make a thread there and say you're selling that item, I advice you to read the rules first, and wait for offers. When you like an offer you let him send the tc and you can send the item using this page:

And in the future, please ask questions like this in beginner sanc: or rapid threads:
Rapid Threads Lmod.
Got any questions? Feel free to ask!