So fashion expert Trinny Woodall has issued her set of tips to help those agonising over outfits.
She warns against anything too revealing – in case it damages your career prospects.
The former presenter of What Not To Wear said: “You are going to be judged on this for months to come by the water cooler. It’s not the moment to don a deep cleavage bra, as you don’t want to be ogled at, and I think it can take away your standing.
“It could be that your colleagues only ever see you in work clothes and so this is your moment to shine. But the office party is not the time to dress the sexiest in your life.”
“Regardless of if you are 25 or 70, if you just dress for your age, not your shape, you are going to miss out on showing off what’s great about you and you might make an expensive mistake,” she said.
If you are going to invest in a new item for your wardrobe, Miss Woodall suggests opting for a sequin jacket or a faux fur gilet.
She believes one of the biggest errors a woman can make is ruining a glamorous outfit by wearing a drab work coat.
But Miss Woodall warns that the Little Black Dress – hailed as the classic party outfit – will not suit everybody.
She said: “We are drawn to black because we think it makes us thinner, but what makes us thinner is continuity of colour. So if you wear a burgundy or navy dress, make sure you have matching tights.”