O'NEILLSouth Pacific Womens Stretch Boardshorts 15 Black

Is 5 and 7 both mediums or do i need to try on both sizes?

Do these shorts have a liner? There are two styles what is the different between the South Pacific and the South Pacific 5 ?

Is the white see through

I am 5.4 tall and and 119 pounds, which size should I order?