The film opens with her bratty brother spying on her with binoculars as she suntans on a beach.
General O'Donnell, still in suntans, was seated at a small desk.
He was a tall, spare man in suntans, with a sunburned face and cold eyes.
also sun-tan, 1821, from sun (n.) + tan (v.). Related: Suntanned; suntanning. As a noun from 1904.