Hello Keith
Unfortunately I don't think you will be able to learn much from the buttons on this headdress. The pattern shown was indeed worn at times by the Rifle Brigade but it was also worn by the King's Royal Rifle Corps.
It is also a somewhat 'generic' pattern worn by many rifle units over the years, some volunteer, some 'colonial' and so on. It is very difficult to pin down an end user based just on this pattern of button (especially when there is no backmark which can sometimes give a clue).
Roger
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