The great interview with the clothes person for the movie, Rob Roy, spent some time discussing that Rob wouldn't have had socks but she left them in because of North American views.
Wish I could still find that interview online.
Anyway, the rules are all part of the Scottish Fad in England in the 1780's. Scots wore what they wanted. Whose side you on?

Actually, don't anybody go there or the mods will be after me.

Being comfortable with yourself is what makes you cool, unless you're too comfort....never mind.