If you have painted her grey (yuk), the crews were RN Reserve, so usually in No8's, Blue shirt, Dk Blue Trousers, Black Shoes or Black Steaming Boots.
Officer in charge RN Uniform, Mechanician in green overalls and black steaming boots.
I much prefer the Buff and Black ones though.
One minor point, I have seen lots of these models with solid guardrains outboard of the liferaft cannisters, they had a chain (removable) to allow them to be launched.
Bob