Keeping in mind that colors in the jacket do not need to remotely "match" anything in any of your kilts, charcoal does indeed work for anything. My own choice was a Harris tweed fabric that, depending on the lighting conditions, could be taken for charcoal or a much lighter bluish-grey, but (as is common with Harris tweed) has flecks of a lot of other colors in it as well.
Here it is up close, indoors:
And outside in sunlight:
And "zooming out" for a bit of distance, in the afternoon on an overcast day:
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