Originally Posted by demue
Agree, just for the ads I would think. They are not allowed to do that when working. Same as they can't choose their make-up but have to use the colors SQ wants. Any change to that would be a big surprise to me. Hmm, anyone with a direct line into SQ? Paging Savage25

They are allowed to let down their hair when they go into crew rest on the 345 flights
Actually, they don't have to have their hair pinned back in a bun - there's a specific hair length (as long as it doesn't reach their shoulders?) upto which they can keep their hair down as long as its straight and remains in place.
And you can always tell the ones who've been working for a while by the subtle differences in the color of make-up/nail polish from the SQ standard - they tend to use their own brands and colors in time.