This goes for most airlines...
If the crew wear ties, wear one. If the crew wear jackets, wear one.
Grooming is so important! Clean Shaven, neat hair, no outrageous hair styles (spikes to be shorter than 1 inch), no unnatural colouring. Girls, your hair should be above the bottom of your collar, no long pony tails or all over your shoulders. A nice bun or french roll would be great. Soft subtle make up which matches your outfit. Don't bother with the bright red virgin lipstick, if you are wearing green!
Virgin used to make you try on the uniform at your recruitment day in the old days, and if you didn't look the part, you didn't get the job. Now the company has gotten alot better when it comes to equal opportunity, but why not make an effort to give them what they want, and show them how you intend to look at work.