In the 1961 French film [Lola](https://en.wikipedia.org/wiki/Lola_%281961_film%29) (set in the Atlantic French harbour [Nantes](https://en.wikipedia.org/wiki/Nantes)), American soldiers wear the white uniforms seen below:

Was this uniform typical for these soldiers in Nantes following WW2?

Are these uniforms credible?  

Or are they fabrications designed to produce a particular cinematographic effect? *(for instance giving an impression of light in the otherwise rather dark setting of the film)*  

I am especially talking about the white color.

![enter image description here](https://i.stack.imgur.com/pcHV2.png)
![enter image description here](https://i.stack.imgur.com/QXhY1.png)