Finding clear, color photos of U boats showing crews via internet search is more difficult than I thought it would be. I found a YouTube clip that might be helpful.
Yes it was hard to decide about colors. I take Osprey's U Boat Crew Book as color reference and applied base colors. I also found some color photos of U Boat Battledress which I tried to imitate on last two figure from the left.
First two from the left are wearing U boat leathers, in light gray, some can be seen on deck gun crews in your video too.
I did not start to lights on the first figure yet. It will be close to second's trousers later.
I did not prefer to use heavy rain coats and their colors due ambient.
About boat's color, U 58 was type II C boat. On this type, earlier boats are in lighter gray, but laters are darker as I can found in references.
Anyway Painting stage still goes on. I can change colors anytime if necesseary.
I want to conclude this project within weekend. Added lights on first figure, played with faces. Hair work and eyes left to be interested.. and the bridge guys.. I also arranged black background for the frame and checked how looks..