When two objects have frequently been seen together, the imagination acquires a habit of passing easily from the one to the other. If the first appear, we lay our account that the second is to follow. Of their own accord they put us in mind of one another, and the attention glides easily along them. Though, independent of custom, there should be no real beauty in their union, yet when custom has thus connected them together, we feel an impropriety in their reparation. The one we think is awkward when it appears without its usual companion. We miss something which we expected to find, and the habitual arrangement of our ideas is disturbed by the disappointment. A suit of clothes, for example, seems to want something if they are without the most insignificant ornament which usually accompanies them, and we find a meanness or awkwardness in the absence even of a haunch button. When there is any natural propriety in the union, custom increases our sense of it, and makes a different arrangement appear still more disagreeable than it would otherwise seem to be. Those who have been accustomed to see things in a good taste, are more disgusted by whatever is clumsy or awkward. Where the conjunction is improper, custom either diminishes, or takes away altogether, our sense of the impropriety. Those who have been accustomed to slovenly disorder lose all sense of neatness or elegance. The modes of furniture or dress which seem ridiculous to strangers, give no offence to the people who are used to them. Fashion is different from custom, or rather is a particular species of it. That is not the fashion which every body wears, but which those wear who are of a high rank, or character. The graceful, the easy, and commanding manners of the great, joined to the usual richness and magnificence of their dress, give a grace to the very form which they happen to bestow upon it. As long as they continue to use this form, it is connected in our imaginations with the idea of something that is genteel and magnificent, and though in itself it should be indifferent, it seems, on account of this relation, to have something about it that is genteel and magnificent too. As soon as they drop it, it loses all the grace, which it had appeared to possess before, and being now used only by the inferior ranks of people, seems to have something of their meanness and awkwardness.