Dress for the job you want. For me its a smart suit or your uniform, my favourite is when people arrive in a suit and bring their uniform with them, it shows they have made no assumptions and are prepared for trade testing. Don't dress like you're going to a night club, no mini skirts or low cut tops this gives the wrong message about your work ethic all together. Casual clothes just look sloppy, like you don't care. Hair should be groomed and tidy with make-up professionally applied. Hands and nails should be impeccable, no long nails if there is a trade test involved, this is real pet hate of mine, short, clean and manicured nails. Good luck and let us know how you get on.