For the record, i have made some modifications to my smock, and have some others to do.
from the picture the most notable one is the addition of a 100mm x 100mm cayote brown velcro patch on the arm to attach the obvious unit and ID patches to, i play on doing the same to the other side.
I have also removed the eppelette (Rank slide) from the cront centre of the smock and moved it to the back of the smocks coller this is now used to secure the smocks hood down when not in use.
I have also added para cord zipper pulls to the zips on the main opening of the smock to make them easier to use.