First off, Buck is an excellent resource, and I agree with his points. I also agree that looking at photographs of the period (NOT REENACTORS!) is the best source for what was actually there. With that being said, we need to remember that just because we don't see something in a photograph does not necessarily mean something wasn't there. A very, very small percentage of people of the time had photographs taken of them wearing what they would have worn while working. While it's obviously dangerous to use the attitude of "Well, it COULD have been there, even if I have no evidence of it.", because of the extremely small sample size, it can also be dangerous to assume something couldn't or wouldn't have been there because we don't see evidence of it. We can be very accurate in general, but it's very difficult to be completely accurate with specifics.