Can you pick a criminal suspect out of a lineup? If they've shaved or changed clothes, you'd probably fail
Many of us would like to think if we saw a stranger committing a crime, we'd be able to identify them later in a lineup. Even if it was only a fleeting glimpse, a haircut or a different outfit wouldn't stop us recognizing them again shortly after. Surely we'd remember their facial structure, or eyes or any distinctive marks?