M&S x Sienna Miller Is Selling Even Faster Than We Predicted – But The Best Pieces Are Still Available

Lauren Cunningham, acting senior fashion news editor, says: 'This silky feel brown dress really is a 'for every occasion' winner. I'll be dressing mine up with a gold strappy heel for party season and pairing it back with a biker boot and jumper during the day. Easy.'

Hannah Banks-Walker, head of fashion commerce, says: 'The leather buckle straps are clearly a nod to Vivienne Westwood – and they give this jacket an edge, elevating it above a classic faux fur style. I like it over a long skirt or dress for a high/low vibe.'

Julia Harvey, shopping editor, says: 'As worn by Sienna herself to the launch event, this white three-piece suit will be a wardrobe mainstay for years to come - providing you steer clear of any red wine for the foreseeable. I love the fit of the jacket and would happily wear it over jeans, too.'M&S

Dayna Southall, head of social media, says: 'The fit of this dress is really flattering and I felt super glamorous wearing it. It will definitely be the piece I reach for from now on when I need to seriously dress up. There’s nothing better than a dress that makes you feel sexy, and this does just that.'

Lauren Cunningham, acting senior fashion news editor, says: 'Jeans and a nice top is the go-to outfit combo for good reason. But this isn't just any jeans and a nice top, oh no, it's the sell-out M&S x Sienna Miller jeans that have returned in two new shades and a sparkly ribbed top that's much more comfortable that it may look. If you missed out last time, best get in line now.'

Hannah Banks-Walker, head of fashion commerce, says: 'Pictures don't really do this jumper justice. It's heavyweight and has the perfect slouchy fit, making it ideal to throw on with jeans or, as I've done here, with a silky skirt and a pair of heels for a low-key party outfit. I bet this is one of the first pieces to sell out.'

Julia Harvey, shopping editor, says: 'This really does feel like a vintage treasure I've stumbled upon – without all the hard work of trawling through endless rails of clothes. I would wear this with boots, under an oversized knit by day. For the evening, I'll wear with gold jewellery and an oversized blazer if I need an extra layer. I can already imagine wearing this dress next summer with boho-vibe sandals and sunnies, too.'

Dayna Southall, head of social media, says: 'This three-piece suit had me feeling like the 5th member of The Cheetah Girls and definitely surprised me. Even though it came up a little short on the legs (I’m 5"6), this suit is every bit as warm (read: practical for winter) as it is a style statement.'

Julia Harvey, shopping editor, says: 'Looking for the perfect jeans-and-a-nice-top top? This is it. This lacy number has a bit of everything from sparkles to ruffled cuffs and, as we enter into silly season, I already know I’d wear this top more times that I’d care to admit.'

Hannah Banks-Walker, head of fashion commerce, says: 'Put this jacket on and you'll instantly feel fabulous. It's the ultimate boho-glam piece – wear it with jeans or dresses, either way you'll look like you're ready for any party. This is the Sienna Miller cosplay we all needed.'

Lauren Cunningham, acting senior fashion news editor, says: The mob wife look trended for good reason and, clearly, Sienna Miller got the message. The faux fur coat screams 2010's glam (I've even spied a pic of Miller in a similar style 14 years ago) while the zebra print clutch and belt add a more subtle nod that's sure to elevate any outfit. The bag is a personal fave – it's the perfect oversized clutch or can be worn as a cross-body bag.'

Dayna Southall, head of social media, says: 'I’m normally against sequins because they can feel a bit much, but this dress is perfect for party season. And if you’re someone like me, who doesn’t like tight dresses on a night out, this dress has plenty of room for movement and Prosecco.'

Lauren Cunningham, acting senior fashion news editor, says: 'With party season coming up, this silky green dress is sure to tick plenty of boxes no matter if you're searching for a Christmas Day frock or a slighty sexy office party look – hello thigh high split. Just be sure to give it a good steam or an iron first to get rid of the dressing room wrinkles you can spot on me...!'

Julia Harvey, shopping editor, says: 'Is it really party season if someone doesn’t have a velvet suit on? Answer, no. This deep khaki duo is designed to be worn open and would look great over a slinky cami or a boho-esque blouse. Plus, the trousers are slightly flared, meaning they’re a flattering fit.'

Hannah Banks-Walker, head of fashion commerce, says: 'Sequin mini dresses aren't usually my thing, but this one has a big velvet bow at the back, which won me over. Miller said it was inspired by David Bowie's Ziggy Stardust era, which is probably the ultimate party inspiration. This dress happens to also be very flattering, although if you're between sizes I would recommend sizing up.'

This will prove to be a very hard-working piece in your wardrobe. Throw it on with an oversized knit and add knee high boots.

The beading on this jacket is, in real life, incredibly high quality. You could wear this on its own with high-waisted jeans or with the matching trousers for a really stand-out outfit.

You could afford to pair these with a simple white T-shirt and you'll still be the best dressed guest at the party.

Try this with straight leg jeans and heels for a very contemporary take on '90s going-out vibes.

The ultimate party heels, these also come in black. Hannah Banks-Walker, head of fashion commerce, tried them on and attests to their high levels of comfort – no mean feat when you're looking at a high heel with gold chain detail.

This silk shirt has matching trousers but it's also a lovely piece in its own right. Wear with tailored black trousers for a stylish twist on classic workwear.

A pair of affordable but high quality silk trousers is hard to come by – trust Sienna Miller to make them a reality. Try these with the matching shirt for a cool twist on a more traditional party co-ord.

These are the trousers which make up the tiger print suit but, if you think the co-ordinating pieces are a bit much for you, wear these with a white T-shirt instead.

Part of the white three-piece suit (yes, the very one worn by Miller herself), while this waistcoat is great for layering now, come next summer, you'll want to wear it with wide leg trousers and sandals.

If you're looking for a contemporary take on bridalwear, you'd be in good hands with this white suit. If, however, you're just looking for some great tailoring, wear these trousers with a cashmere knit for an elegant autumn/winter outfit.