Definition of "snowy"

So we continue climbing to the saddle of the Kleine Scheidegg, where ahead there comes into view the wide expanse of the Grindelwald valley, backed by the snowy crown of the Wetterhorn.

1960 December, Voyageur, “The Mountain Railways of the Bernese Oberland”, in Trains Illustrated, page 752

A man got up in all the outward trappings of a gentleman: an extensive display of snowy linen, unimpeachable tailoring, ganté, botté, in perfection; nothing overdone.

1873, Grace Ramsay, A Salon in the Last Days of the Empire, and Other Sketches‎, London: Richard Bentley and Son, page 4

Adult male snowies are nearly white. They become whiter as they get older. Female birds are usually white with narrow black or brown bars and spots. Young snowies are darker than the adults, and they have heavier markings.

2010, Elaine Landau, Snowy Owls: Hunters of the Snow and Ice