So, it seems that the general concensus to to wear appropriate clothing for the task.

I guess that those people that talk about owning "beaters" for their dirty work and talk about oil changes are just talk. In the absence of a UK type modesty snap/button I can imagine no way to do all the shimmying, shifting and sliding without accidently flashing someone.

Other than a couple of you that have crawled under your cars kilted out of necessity, I guess that everyone else dons something that provides a little more security.

Thank you for your responses.