Interestingly, the senior cabin attendant, the one leading the flight, is generally not involved in the first class service. After boarding she will usually stop by for a chat and to introduce the head of the F cabin, and then come by for a chat and a thank you at the end of the flight. But that's about it.

(I write she on purpose, I have yet to see a male senior cabin attendant on international flights)

The beige and white jackets appear in the economy cabin as well. Not quite sure what they signify.