L.L. Bean Women's BathingSuit Top SwimSuit Multicolor Swim Clothes  in great condition.  The size is missing from this item.  This is a bathing suit with a top/short skirt covering it depending on the height of the woman.  See images.  This appears to be for a larger woman.
Measurements are - Armpit to armpit - 19 inches
Top of the should straps to the bottom of the top/short skirt end - 30 to 30 1/4 inches
Side end of the blue & White top  to the other end across is  - 17 1/2 to 17 3/4 inches

Note that measurements are approximate.