https://www.ebay.co.uk/itm/WW2-Briti...8AAOSwySlaMSu6
shows RIM style buttons retained on RIN uniform just as Cdr Hastings
book says (attd)
cap badge RIN as for RN with KC
To 1950.
Gieves tailored material with RN buttons was worn by a few
IN officers to the early 70's unaltered