Hi @PierreGtch, thanks for your effort.

I get your point of tweaking the boxplot's alpha (only the box, this way). I tried your code and realized that some people would not like to use the same alpha for kde and box.

I propose the following: when scanning for kwargs under box elif "box_" in key: add an if statement for the alpha kwarg and add it to the boxprops using update method. This way one could call box_alpha separately.

does this make sense to you?

Then I would rather scan for box_boxprops and update boxprops with it. It would allow to stay consistent with the seaborn API and also to overwrite the boxprops argument. What do you think?

that sounds nice. the boxprops is going to get updated and not overwritten, correct?