Haha, "I'm a rebel" XD I think you'd find a real mix with the rebels to be honest, in some cases they'd be disheveled yeah, the ones who simply ran away for whatever reason, but "rebels" are not that, it's more likely that rebels would not have as uniform equipment, but they're just people who rebelled, they're not even necessarily living in the forest like Rob, they might have broken from the kingdom, in which case there would be no difference between them and the "normal" troops, especially considering they would provide their own equipment.
Not sure how you ID them though, perhaps they would wear different surcoats and have nothing on their shields (not realistic but close I suppose). The only case where I could see normal troops looking really out of place is with the Swadians, they're just way too uniform. Maybe the rebels could have more dirt/grime/mud on them, except in the case of the leaders of course.