Peter
an thought provoking topic, it will be interesting to see the responses.
These days I pay little attention to the fixing. I try to study photos from the period 1881 - 1922 which is the period that interests me and judge from that.
The badges worn on the white FSH are a little easier to ascertain, in most cases the full dress badges and the FSC badges were also approved for the FSH and I tend to see this born out with the full dress badges in use. I am not aware that the fittings at this time were in gereral, any different for the FSH than for the other headdress.
Later in 1903 we had the effort to try to use the HPC , glengarry grenades etc noted here in post # 9.
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I think c. 1903 is where these long sliders begin to come in but I am more inclined to think that they were originally intended for the so called slouch hat.
With regard to the khaki FSH , although badges were expressly forbidden for wear I sometimes see un-official badges in wear and I get the feeling that regiments exercised a lot of freedom in what they unoficially wore in this headdress pre 1922.