Yes, they are hard to find. One came to eBay about a year ago but it was a shade too small. I investigated the possibility of having it altered by a reputable kiltmaker but in the end he didn't think the kilt had enough surplus material in it to work with, and dissuaded me from wasting time and money on the attempt.

I saw the TA unit, with pipe band, kilts in evidence, marching in Liverpool in the late 1980s; I'm not entirely certain if it's status now is active enough to allow for issuance of MOD clothing that isn't regarded as combat-essential. So how long has it been since a batch of regimental Forbes kilts were made? And would the material be the same? Modern army tartan doesn't seem to be at all like what I have seen in the past (e.g., the Thomas Gordon firm that is credited in so many older kilts). I need to also make inquiries among Canadian contractors and see what is being provided to the kilted Canadian reserve units.