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If we always followed the rules, we'd have never tried dresses over pants, or white jeans after Labor Day . . . or a miniskirt at the office. You heard right — you can wear the mini hemline to the office (within reason); just let this bit of street style be your guide. The sophisticated styler you see here worked the skirt just right, toeing the line between fashion-friendly and office-appropriate by adding in a few sophisticated counterparts, like a well-cut blazer and a chunky turtleneck to temper any sexiness. But it doesn't stop there; if you're trying out a miniskirt at the office, you'll also want to ensure that you're covered up on bottom. Opt for classic black tights to finish it off (read: anything decorative or lacy will up the sultry factor, so steer clear of those). As for your footwear, keep it simple with a pair of Fall ankle boots — and be advised, anything with a sky-high heel, metallic finish, or peep-toe is better left for your off-duty style. Keep it simple and sophisticated, like so, and just like that it's take-your-miniskirt-to-work day. Just shop the look to channel the same flawless style.

Shop clockwise from top left: T by Alexander Wang Marled Mockneck Sweater ($260), Topshop Ponte Boyfriend Blazer ($80), Alexander Wang Prisma Tote ($725), J.Crew Cosabella Super-Opaque Tights ($25), Zara High-Heel Strap Ankle Boot ($90), Alexander Wang Zip-Detailed Wool-Blend Mini Skirt ($174, originally $435)

Kate Middleton was polished perfection working this beige bow-accent Max Mara coat ($1,497) on an official visit to the Guildhall in England. The duchess has mastered the prim and proper style of English royalty, and her latest look is right on point. Kate's ladylike topper is perfect for the holiday season and beyond, so shop her exact coat now to pair with everything from dresses to denim, or cinch this funnel-neck Aspesi coat ($508) with this Amantes Amentes bow belt ($54, originally $90) to nail her majestic style on a budget. If you love her entire look, shop similar pieces at FabSugar.

We're about to double the number of Winter-wearable items in your closet without spending a dime — the secret? Keep your summery dresses where you can see them. That's right, if you haven't already packed them away, we've got a better idea for you: equip these lightweight numbers with the appropriate seasonal layers (soft, fuzzy cardigans, thick tights, booties, and slick outerwear); then there's no reason to pigeonhole these warm-weather pieces to a four-month window. For those on the fence about crossing tried-and-true dressing lines, we've got a star-studded lineup to make a strong styling argument and we're providing easy tips below. Just keep reading.

First up, an effortless-looking Keira Knightley put a cozy-layer spin on her paisley-printed sheath just by adding a long black cardigan, black tights, and black ankle boots. Next, Nicky Hilton edged up a sweet LWD with the help of a tough leather moto jacket, stud-embellished clutch, and yet another pair of ankle boots. And most recently, Amanda Seyfried was spotted in Tokyo promoting Les Misérables in a bright floral-printed dress, which she then cinched with a wider black belt and juxtaposed with black tights and black boots. If you think that this styling formula looks simple, that's because it is. Here are our four key pointers for keeping a little piece of Summer with you at all times.

• If you want to save your cardigan for another rainy day, offset your lighter fare with your favorite cable-knit sweater or turtleneck on top. It will not only add a layer of warmth (a necessity), it also provides an instant play on textural contrasts.
• Some Summer sheaths are a bit more billowy, so be sure to provide your shape with the definition it deserves. Our two preferred ways of cultivating a flattering silhouette? Cinch it with a darker leather belt (the wider, the better) or top off your dress with a fur vest, which contrary to what you might think, actually pulls in your dress to cut closer to the body.
• Three words: cold-weather accessories. Just like the starlets above, you can't try your hand at even the prettiest Summer dresses if your legs and arms aren't covered. We suggest wool tights (or at the very least, an opaque iteration), leather boots (rain boots for inclement scenarios), and a jacket that actually traps the heat. Whether it's a structured leather jacket or an oversize felt car coat, it's all about injecting an overt Winter edge from the outerwear in.
• For the more daring fashion set, you could go the dresses-over-pants route, and by that, we really mean, styling your favorite summery dress over a pair of ankle-cut trousers. It's definitely not a look that everyone loves (we do, though!), but if you're a fan, 'tis the season to try it on.

Lily Collins may have been surrounded by a slew of stylish stars at the British Fashion Awards in London, but it was her black leather-trim Mulberry gown and gold ear cuff that really captured our attention. The actress worked her sleek gown with a skull wrap ring and dark red lipstick to create a flawless goth-meets-glam look that is the perfect alternative to a bright holiday dress. For your next cocktail party, take a cue from this brunette beauty and work a black gown with a statement ear cuff, then complete the look with this black fur Topshop stole ($40) for extra warmth.

Kate Walsh attended a movie screening in LA last night looking like the ultimate cool girl in this Etoile Isabel Marant striped tweed jacket ($460). On bottom the actress wore a pair of faded skinny jeans by Citizens of Humanity ($218) and black ankle boots, then accessorized via a black scarf and a black leather crossbody bag. Mimic Kate's latest casual-chic look on the weekend by getting her exact jacket — or sporting one of your favorite tweed jackets — and mixing it with cool jeans, booties, and a scarf. For a work-appropriate version, swap the denim for black trousers.

Rachel McAdams walked the streets of Beverly Hills showing off her newest bag: this Loeffler Randall red Rider bag ($495). The structured shape and vibrant color make it a Fall must have — the price tag isn't killer either. The rest of Rachel's ensemble included a ribbed white sweater, light gray skinny jeans, and brown gladiator heels. And we love that she finished her look off with a colorful beaded necklace for extra charm. Love Rachel's latest look? Shop similar pieces, including her exact bag, now.