Is there a name for this?

[OC Richard]

I think Bruce Scott had the right of it with the QOCH tie. Since he served with that unit, he wore that tie a lot, and was wearing it in the photo with the striped hose.

Yes it makes sense for the reasons you mention.

However the careers of army Pipe Majors may span a number of different units. (They can be assigned to any unit that needs a Pipe Major.) I wondered about the socks representing some other regiment or battalion with which he may have served as PM. But the only reference I see is to him being a Corporal piper in the QOCH (which battalion isn't mentioned) and as Pipe Major of the 4/5 Camerons, a Territorial unit.