if I buy a set of textures, I get the arts or are the textures?

If you mean to buy it on the shop http://forum.toribash.com/tori.php or the items subforum http://forum.toribash.com/forumdisplay.php?f=64 you will get the items.
If you mean to buy it on the art market http://forum.toribash.com/forumdisplay.php?f=152 you will get the art.

Moved to Rapid Threads - this isn't a discussion topic. Refusal to read the rules of each board and posting in the incorrect section repeatedly may lead to infractions a plenty.

If you buy the actual art for the textures, you won't receive the texture items that let you wear the art unless the seller specifies so.