Sienna Miller’s High Street Coat Had A Waiting List Of Over 40,000—Here’s Why It’s Still Our Favourite

Not all trench coats are created equal. How do I know this? Well, when Sézane produced a cotton, slightly oversized version available in five different colours (which we'll explore later in our Sézane Clyde Trench review) it proved to be so popular, it had to be restocked five times and amassed a waiting list of over 40,000 people.

Of course, it helps that Sienna Miller wore it while in Paris last year. As we all know, anything she wears – whether it's her high street trainers, the perfect rainy day outfit or anything from her sell-out M&S collection – flies off the shelves, thanks to her winning combination of looking simultaneously glorious and somehow also relatable. Luckily, Sézane is responding to the demand for this spring-ready coat, which has just been restocked (in new colours, too).

One new colour that has been causing quite the stir is the brown gingham hue. The Sézane Clyde Trench has already cemented itself as the coat of the season (if not the year), and this latest iteration only fuels the frenzy. A fresh spin on the beige predecessors of the Parisian brand's signature outerwear, the brown gingham/ecru combination injects a touch of bucolic charm. The demand for it? Predictably, sky high. Ideal for the transition from winter to spring, it's crafted from the same weighty organic cotton twill, which gives it a luxe feel without being too heavy.

Grazia's Gemma Lavers managed to get her hands on the new gingham style. She says: 'Sézane's sizing, in general, comes up pretty average so I love the brand for that. To give you all the details I'm 5'4" and I'm usually a size 10 - so, as stated in the size guide I took a size 10 in the Clyde Trench. I'm so glad I did as it's perfectly oversized and large enough to fit a jumper on underneath to layer up in the winter. Unlike some versions, this one isn't reversible, but honestly? The gingham is so good and just the staple coat I was after that I wouldn't want to hide it anyway. The fabric's thickness gives it a nice structured drape and I'm a big fan of the two large side pockets. I can't wait to style this in the spring over the top of a white tee, jeans and ballet flats.'

Grazia's Gavi Weiss, also took the trench coat for spin in its original ecru colourway, paired with straight-leg jeans and square-toed boots. She, of course, like the rest of us, had the trench on the 'need to buy on payday' list, but also struggled to get her hands on the cult trench - until now, that is.

The secret of Sézane's appeal? All of the clothes possess a timeless, elegant quality. They feel well-made, they're easy to wear and they really do last – season after season. Chances are you've heard of Sézane. Perhaps you're an obsessive follower of the French brand, or perhaps you simply heard it mentioned by a friend. Maybe you have no idea what I'm talking about, so it feels pertinent to inform you that Sézane has one of those fervent, excited followings that always tends to happen whenever anything identifies as French.

Having said all that, I probably don't need to stress that this trench will likely experience the same sort of success again. So, if you don't want to find yourself as person 40,000 on a list of trench coat fans once these restocked shades inevitably sell out, I'd suggest you act fairly quickly.

How we tested the Sézane Clyde Trench

When it comes to finding the perfect trench coat, we don't just take a quick glance - we make sure to put it through its paces. For the Sézane Clyde Trench, our criteria was a piece that is made to the highest standards, including fabric quality, fit, comfort, wearability and style. For example, does it layer well? Will it see you through the seasons? Of course, it is a resounding yes to both, and the final verdict is that the Clyde Trench is one of the best on the high street (and that's according to two Grazia writers). Not only delivering timeless style (as proven by Miller), but also real-life wear. It's an investment, but a great one at that.

Shop: The Sézane Clyde Trench Coat

Hannah Banks-Walker is Grazia's head of fashion commerce. She has previously written for the likes of Harper's Bazaar, The Financial Times, Glamour, Stylist, The Telegraph, Red, i-D and The Pool on everything from fashion to curly hair (hi!) to the patriarchy. Not necessarily in that order. Find her on Instagram and Twitter. But please don't look for her MySpace profile, which until now was the last time she wrote about herself in the third person.