Over at Rich Reynolds' blog - UFO Conjectures - you can find a new article from me. It is focused on the two different kinds of Men in Black that people report.
There are those MIB who look like agents of government, and there are those who are pale-faced, cadaverous creatures that don't even look fully human. But, both of them dress in similar - if not identical - clothing.
Why and how do we have more than one type of MIB? You can find the answer at this link.