Feild service cap colour?

[gb64]

Hi all, just after a little help if any can, I’m after the colour of a Middlesex Regiment OR’s Field Service Cap.I have looked high and low for my little book on the subject from the MHS but it’s gone can’t find it I know I had it but not now , probably find one of my grandchildren has used it for a colouring book anyway I’m checking on the colour if anyone can help, was it a dark blue or black FSC with yellow piping just to the top seams ? I’ve looked else where for information this but nowt I can see so any information much appreciated.
Thanks

Gerard