I have a basic page with some clothes on it and all I want is 'add to cart', 'proceed to checkout (via PayPal)', 'clear cart' as well as flat-rate shipping and quantity shipping stuff.

Alternatively, is it recommended to replace the existing HTML with my own page/CSS while keeping the above cart stuff?

Basically, I don't need the 'look' of the default template as I already have a layout without any shopping cart.

Hope this question makes sense.