How to Complete this Outfit?

[MacMillan of Rathdown]

OC Richard, is there a specific reason you suggest a wing collar? I have one and it has hidden buttons, which might address my concerns about the visual imbalance of the black button studs...

And that goat hair sporran is a real beauty!

Here is a close-up of my horsehair sporran. My dad used to wear it when he played with the Edmonton Boys Pipe Band fifty years ago.

If you haven't already done so, you should apply to the Canadian heraldic authority for a grant of arms, and then have the shield engraved on the escutcheon on the cantle of your sporran.

As regards the wearing of wings collars, I'd suggest "don't", unless your shirt is of the variety that uses a proper, removable, collar. The reasons for this are many and varied, but center around the fact that proper wing collars tend to have bigger points, and are taller, thus presenting a more elegant appearance. They are also heavier, with the result that they don't wilt half way through the evening. Attached wing collars inevitably have minuscule -- underdeveloped?-- points, and some are so low cut that they barely rise above the collar of the jacket. In order to make the collar withstand the rigors of an evening's outing it is necessary to over starch the shirt, making it both overly warm and uncomfortable at the neck and arm holes.