Another resource about WWI units is The Great War forum.
A quick search found this discussion
https://www.greatwarforum.org/topic/...d-highlanders/
About the appearance of the 1/7 Argylls, from the photos I'm seeing they appear to wear the ordinary A&SH uniform.
I looked through a number of the photos linked to above, and I'm seeing what appear to be the ordinary A&SH cap badges and collar badges, Glengarry dicing, etc.
Supposing that the 7th looked much like the Regular battalions, here are some photos giving an idea of their appearance.
The tidied-up uniform. On active service the sporran would be been replaced by an apron or even a gas-mask bag, the spats replaced by puttees, and the full P08 webbing equipment worn.
Here are Highlanders in combat kit
I did find this badge online. I'm not seeing WWI photos of members of the 7th Argylls wearing it, so it is probably a pre-1908 badge.
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