Both Uses of

contrast
in
Me Before You

I could see his pale collar, his dark suit jacket a contrast against it.
p. 185.0

contrast = something notably different

The older women, in kitten heels, wore structured suits, with padded shoulders and silk linings in contrasting colors, and hats that looked as if they defied gravity.
p. 284.3 *

contrasting = notably different

Definitions:

(1) (contrast as in: contrast their writing styles)
point to differences between; or compare to show differences
(2) (contrast as in: there is a contrast)
a difference -- especially a notable difference; or the side-x-side arrangement of things that draws attention to an unmissable difference
(3) (contrast as in: sharpen the picture contrast)
the difference between tones of an image -- as in a photo or video -- such as the quality of brightness or the intensity of shades or colors