As with the line, the militia belonged to the South, Center or North division, with their piping and turnback colours being red, white and yellow respectively. Unlike the regular line however, they had yellow (as opposed to white) plumes, and the officers and NCOs could often be found in bicornes in contrast to the shakoes of the line.
I personally find the yellow plumes slightly unbecoming, but apparently they were quite popular with some of the dandies of the day who enrolled as officers in the militia battalions upon the outbreak of hostilities with France, and many undoubtedly added their own affectations to the standard pattern:
Here are three from the Southern division in the form of the Lagos, Tavira and Beja battalions:
and the Lisbon and Oliveira dos Azemeis battalions from the Central Division:
The militia were mainly employed in the defence of towns and on garrison duties, so it is unlikely they will see the light of day in any of our games. Unless of course we mount an Iberian campaign at some point, in which case they might come in useful.