What size should I get for AE shorts?

I want to order these lowrise AE shorts online. This one: http://www.ae.com/web/browse/product.jsp?catId=cat380159&productId=3331_3123
I live overseas where there isn’t any AE store so I can’t go into a brick & mortar store to try them. I don’t know whether the size chart is accurate. My natural waist is 27″ and [...]