The interview was pretty formal and I wore a shirt and tie so I would say hair should generally be up.
You can have your hair down
Yes in the interview, but not when on shop floor learning how the till process works.
It doesn't matter
Within the interview it doesn't really matter whether your hair is either up or down. But it's probably best to wear it up so that it shows that your agreeing with the rules they are giving you. And shows your eager to be part of the work place.
You can have your hair however you want it for the interview. Just be prepared to have it all under your hat and in a hairnet when you start work.
Well, as for me as I am guy I just had a hair cut and I will it would be appreciated if hair was tied up as it looks more professional
Down its quite an informal interview process but obviously look smart
You dress as you would, uniform and dress code is required to work
I had mine down. nothing too fancy though.