"Elegance is refusal" Coco Chanel, later used by Diana Vreeland. (I had remembered this as "fashion is denial" but when Googling to get the right author found I had it wrong! The principal is the same, though.)
"I have heard with admiring submission the experience of the lady who declared that the sense of being perfectly well dressed gives a feeling of inward tranquility which religion is powerless to bestow.". Ralph Waldo Emerson
This one makes me feel guilty, as I am a religious person, but same days it's just plain true for me