I have built a clothing website for a client.

Tees.php Is a page with pictures of all the products. (about 20)

Is there an easy way to create a item page for each t-shirt with a little information and buy it now link.

So every item page will be the same structure wise but with a different .jpg/title/description.

But I don't want to create 20 separate pages.

Whats the best way to do this ?

is this a database driven site?

Nope.

Could I use wordpress to do it some how ?

Yes. Check out the WP e-Commerce plugin (http://wordpress.org/extend/plugins/wp-e-commerce/).