white coat hypertension

all fur coat and no knickers

Having a superficially positive appearance that is belied by the reality, e.g., superficially elegant and beautiful but actually common.

black-and-white

Classifying people, objects or concepts as two polar opposites, especially "right" and "wrong"; dichotomous and inflexible.

cut one's coat according to one's cloth

To live within one's means, without spending more than is affordable.

turn one's coat

To turn against a previous affiliation or allegiance.

wash a blackamoor white

To labour in vain, especially so as to present something as better than it really is; to whitewash.

white bread

Bread made from white flour.

white hat

A good person; a hero.

white lie

A deliberately untrue statement which is intended to produce a favorable result; especially, one which is judged to be better than an overhonest alternative, as for example to remain polite in a superficial social exchange, or to choose one's battles.