black and silver prom dress Primavera Couture 4301 Size 6 Long Sequin Slit V Neck Strapless Formal Pageant Gown 16 Strapless Bustier Left Leg Slit Fully Hand Beaded *Type in style number (11236) in search bar for additional colors! Sherri Hill Strapless Sequin Beaded

Lay your T-shirt flat and measure across the T-shirt where you want your skirt to start

At a black-tie event, there's an opportunity to be a bit creative with your eveningwear, whether it's with a print, color, or statement accessories, depending on the event

Make sure your outfit is not 100% practical, otherwise you will look incredibly boring - festivals are all about having fun, so add some frivolity via a playful skirt, swishy midi/maxi or a ruffle blouse - 'high-low' styling feels effortlessly modern in my eyes." If you're wanting to replicate Sienna's iconic maxi dress moment this summer, we've find our favourite high-street alternatives below: If you're also wondering how to dress for upcoming festivals, read our fashion team's grown-up guide to festival fashion HERE

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Fashion is about expressing your individuality, and sometimes that means breaking the mould