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Rather than working yourself into a wardrobe frenzy before work or a big night out, plan what you're going to wear ahead of time. 'Choosing an outfit in a hurry can make you feel a bit "thrown together",' says Catherine de Groot, co-founder and director of beauty company Trilogy. "Now I plan an outfit the night before, even down to choosing underwear and accessories. It saves lots of time and means I head out feeling much calmer.'