No that's not oak, it is a funny (in my opinion) pale salmony colour and looks a bit washed out. Can't recall what Mulberry's name for the colour is off the top of my head, although I am pretty certain it isn't tan. Thinking about it, it might be coral.
Nude is a pale sand colour, whereas the picture shown is more pinky. It might be possible that Mulberry name some colours differently in the UK and US though, if your nude looks similar to the photo in yoox.