Definitely a suit that is dry cleaned, and it depends on your role. Need a good pair of quality heels and flats. If you need to wear a shirt, it should be professionally dry cleaned.
In my freelance writing/editing/publishing work, and as a Creative Director, I can go down a bit, yet still be trendy. Loving dresses with belts at the moment, with hair tied in a bun and an expensive clip. Dress to impress, and to make yourself feel fab :) You're on :)
To dress for success is part of the deal.
It makes a huge difference, mainly because the attention to detail...brings confidence to anyone who comes into contact with you.
How do you do it?
Thats another story....don't be told you can look a million dollars on a budget!
The first thing you need is a keen eye, esp to detail.Make sure you do not buy second hand clothes for this one. EVER.
You need 5-6 lint brushes, save to buy well made clothes from a up market department store.If you can go higher(with your budget) do it.
Never wear prints,wear strong colours but not too bright.Well made shoes, never under $100 per pair.If a woman NEVER a cheap handbag, must be leather and invest in black that go's with a good pair of black shoes...that go with anything.For men, never a inexpensive wallet! Invest in one that is over $100.When a man pulls out his wallet, that speaks huge volumes.Never ever put a condom in your wallet! for chance it fall out....That is a huge no-no.Men should always have VERY CLEAN nails, and very well cut...Hair should be always cut, and shampoo every day...same for the girls.You need 30 mins extra to dress than others, so you make sure you have dressed in a calm manner.Have a look on the net for grooming advice for men and women.
Dress appropriately for you job. I used to work with the long term unemployed training them to find work, and I would always tell people to dress appropriately for the job. No point wearing a suit to an interview for a plumbers apprentice.