Please, an opinion on Kriegsmarine buttons!

[partisan]

I am waiting to receive a leather grey jacket of Kriegsmarine, but without the buttons!
I went on the web to understand what I must sew on this jacket.
But I have seen 3 different types of buttons.
1. yellow buttons (gold),
2. gray buttons
3. leather buttons,

see the photos:
gold:


grey:


leather (they are civil?):


At this point you wonder what is more correct to sewing on my jacket Kriegsmarine? Those leather? those in gray or gold ones?
I think the gray ones are more correct, in your opinion?

Thanks
partisan