Lilly Pulitzer shell slacks pants

These pants are in great condition however they have no fabric tag or size tag. Otherwise great condition. Khakis with pink shells. Perfect for the beach and summer. Zipper and button front. Front and back pockets. Waist measures 17 inch. 35 inches long. My guess is these are probably a medium. But please check measurements. They are probably a cotton spandex they do have a little bit of stretch. Dre