Jacobite Kilt Wear Question

[Harper]

Sorry, I can't seem to correct the title on my phone. It should read, "Jacobite," not "Jacobean."
Hello,
As my name suggests, I play the Celtic harp, semi-professionally with every intent to go full-time in a couple of years when I retire from flying rescue helicopters.
I have been putting together a Jacobean kit for performing as a harper and storyteller at Celtic events. I've played a few festivals with the modern kilt kit, but have wanted to do the historical kit and so piece by piece it's been going to together and it's closer to done than to begun. I've been holding off on the great kilt, as the plaid I have in mind wasn't available when I was last minded to buy and I'm not under any deadline.
I did recently get the jacket. It fits, it's quality-made including some concealed pockets that surprised me when the tailor just put them in; they certainly will come in handy...and it's way heavier than I thought it would be.
I can see wearing it in the mornings, but for on stage for 45-minute sets in the afternoon I don't see it working unless I'm playing in outside temperatures that are too cold for anyone to show up.
And there's the issue of pinning the plaid to it. Since I think I probably have to do the great kilt, as the kit is a well-to-do retainer of a gentleman, I figure I have to pin it to the left shoulder, as the right has the harp laid against it.

• So, to my questions: would it be scandalous, in the Jacobean period, to remove the heavy, too-hot jacket and just pin the plaid to my waistcoat in the warmer parts of the day?
• Or, would it be better to unpin in from the jacket, remove the jacket and pin the plaid to itself at the left shoulder, part across my back and part diagonal across the chest?
• If none of those work, would it be scandalous for a gentleman's retainer to wear the phillabeg instead of the full-boat great kilt? I mean in the painting "Lochaber No More," the only one wearing a full great kilt is the Prince - his men are in phillabeg. Then again, that's a Victorian painting, so I don't know about its accuracy...

Anyway, your help is appreciated.
Cheers,
~ H.