The reminds me. When I was shooting the red jacket, the red jacket ended up, well, not red, at the bottom. More purplish. Look:
The reason: overexposure at the bottom, specifically of the RED pixels, when I expose enough to get the top lit. The model was too far from the window, so the light hit mainly her bottom half. Hard to see in person, but easy to see in the camera.
The solution: In Lightroom, in the DEVELOP module, go to the HSL pane; select LUMINANCE, and drag the RED Luminance slider leftward (minus). Now you get this:
Now that I am not blowing out the reds, I get a red coat!
Then the last step: I brighten the top with a graduated filter with exposure set to +1 stop. Now I get the final result:
This is all a matter of simply recognizing what is wrong. I was not able in time to fix it on site, but I knew I had enough leeway in my RAW files to fix it later. Sometimes, that is how it works.