I can't see the picture, but I looked through the MacLeay portraits elsewhere. Unless I miss my guess, your man is the one leaning against a boulder, with a Glengarry in his hand and more hair below his eyebrows than above.

Might we consider this jacket a modification of the Sheriffmuir? The buttons on the wearer's right resemble the buttons on a Sheriffmuir, but instead of buttons on the left ( as we usually see,) there are vestigial buttonholes. I think it does look a little like a Kenmore and a little like Highland Clans' ACHARA doublet:
http://www.highlandclans.com/Kilt_Doublets.html only without the gilt braid.

Hothir Ethelnor's Gordon Tartan doublet is similar, as I remember. He had a thread on it last August...