And a liberal in the identification game would say he would not know which of his perceived acquaintances should be excluded. Casual clothes come in a wider variety of styles, and they do not conceal the shape or movements of the body as much as most more dressy styles do. The inability to recognize faces does not extend to hair, particularly if it is long enough to extend out of the face area, such as down upon the shoulders. Longer hair also acquires a pattern in its texture, particularly if it is wavy or multicolored, and that can be seen. Though we have difficulty with facial features, often we can process hair lines.
Facial hair provides more hair lines to process.
We hate it when waitresses all dress alike, because we never know which one is ours. Cops to us all look the same. One mother of a face blind youngster told me her kid had a nervous breakdown when his school instituted uniforms, because it made a very stressful situation far worse. The worst situation my face blindness ever put me in was when I entered the Navy. I found myself surrounded by hundreds of people who all looked exactly alike.