I guess we would need a little more information. When you say re-enactment, do you mean these are people you are trying to acurately portray a certain time period in Scotland? Such as those who recreate Culloden and other battles. Or do they just like to dress up in period dress and eat smoked turkey legs? We have both over here. The first kind are very serious about getting everything correct and spend extreme amounts of time and money getting their persona correct. The other kind are usually part of the SCA (Society for Creative Anachronism) group. These usually host the Ren-Faires where there is a broad range of period dress. While there are some in the SCA who are very serious about their persona, not everyone there takes historical accuracy in consideration. For them its all about having a good time.

So what did Scots in that time period wear? Well, it would depend on what part of Scotland they lived and what their social status was. I would imagine that the lowland Scots would have worn what the rest of Europe was wearing as the fasion of the day since that part of Scotland was accessible to the rest of Europe. So it could have been those doublets and hose. Especially for the well-to-do.

I would ask your friend as she would probably be the best source of how other men there will be dressed. She might even be able to scrounge somehting up for you. Sometimes these people have extra bits that they've put asside as they improved their look. I guess the important part is to have fun.