I would think most any quality retailer of Scottish Highland clothing could supply such a jacket. Freedom Kilts, Burnettes & Struth, etc., would all do well.

Now, if you go into a random Scottish import shop and ask for a "modern kilt jacket" they may not know what you are talking about, but if you ask for a "three-button craill jacket" they should be able to provide that.

Here's the STM's version of such:
http://giftshop.scottishtartans.org/wallacejacket.html

The jacket I am wearing in the photo has braemar sleeves, but here is me wearing the same style with craill sleeves (and an additional ticket pocket).