This was ultimately a famous British regiment but had a rather drab SYW (from a wargamer's perspective!) as it spent much of the war in garrison in Gibraltar. No doubt this was essential duty and the fame of the regiment seems more to have stemmed from its later history.
Again no point in re-inventing the wheel so here is the Kronoskaf page with history and uniform details:
https://www.kronoskaf.com/syw/index.php?title=7th_Foot

