Cock feather in a bonnet for civilian attire.

[Tobus]

Wow, ya learn something every day! I always thought it was nonsense too.

A macaroni (or formerly maccaroni)^[1] in mid-18th century England, was a fashionable fellow who dressed and even spoke in an outlandishly affected and epicene manner. The term pejoratively referred to a man who "exceeded the ordinary bounds of fashion"^[2] in terms of clothes, fastidious eating and gambling. Like a practitioner of macaronic verse, which mixed English and Latin to comic effect, he mixed Continental affectations with his English nature, laying himself open to satire

Perhaps there's a lesson to be learned here, especially for the American who goes a bit too far in emulating Scottish dress and mannerisms, "exceeding the ordinary bounds of fashion". As in, "mixing Highland affectations with his American nature, laying himself open to satire". Would we call him a MacErroney?