I feel like it was literally just Boxing Day, but apparently no, we're somehow in the middle of March, which means it's Afterpay Day AND the mid-season sales all at the same time. Phew!

In case you missed it, Afterpay Day is a huge sales event that runs twice a year, with stacks of brands across fashion, beauty and lifestyle getting involved in the discounts.

The official sale kicks off on Thursday, March 20 and runs through to Sunday, March 23 — but many retailers are starting the party early.

This is a great time to stock up on essential pieces that'll see you through the cooler months ahead. Unlike the end-of-season clear-outs, brands are still offering current styles - only for much, much less. Honestly, you'd be silly not to!

Watch: Jessica Vander Leahy tries the Style Maths method. Post continues below.

So what's on offer? Er, how much time have you got?

To help you cull it down, I've pulled together an edit of pieces with staying power, from an oversized knit I've been lurking for months to straight-leg jeans you can literally wear with everything. Plus, some statement accessories that'll dial up all your winter looks.

Scroll to the end for a list of all the Afterpay Day sales you do not want to sleep on.

Shop the Afterpay Day edit.

Lioness Gigi Knit Jumper, was $99, now $59.40.

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I clicked so fast on this creamy oversized knit when I saw it was on sale. The slouchy fit and cable-knit detail offer just the right amount of preppiness, while still feeling completely classic. You can even wear it as a tunic with a mini and tights.

NA-KD Classic Bonded Jacket, was $179.95, now $89.97.

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This bonded jacket is extremely cool, but not so cool you won't be wearing it in a years' time. The touch of faux fur is very current, and I'm a big fan of the statement collar, which gives it a point of difference from other bomber options on the market.

Levi's 501 Original Jeans, were $159.95, now $119.96.

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While trending jean styles come and go, a pair of blue Levi's 501's is forever. I love the cut of these and can see them being a staple in my closet for years to come. I'll style them through autumn with cardigans, sporty sweats and flats.

Assembly Label Vintage Straight Jeans, were $120, now $90.

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If you're more of a fan of wide-leg styles, but don't want to go too baggy or barrel leg, these Assembly Label jeans are the perfect solution. They're another timeless fit that'll elevate all your day looks, whether you dress them up with a boho blouse or dress them down with a tee and bomber jacket.

Dissh Canne Cream Pant, was $139.99, now $56.

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A Dissh sale is not to be missed, and I could easily include 17 more items in this list - but I couldn't go past these chic wide-leg pants. Slouchy tailored trousers are one of this season's absolute essentials, and if you're new to the grown-up pant club like me, you'll be surprised how easy they are to wear. Not to mention, the discount on these is eye-watering.

Tony Bianco Drax Zebra, was $219.95 now $100.

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According to my sources, zebra is set to replace leopard as the animal print we'll all be wearing next, so pop these in your cart if you're looking for a statement heel that hits the right notes - at a fraction of the original price. The backless mule shape is so wearable, and will easily take you from the office to evenings out.

Adidas Originals Gazelle Indoor, was $200, now $160.

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The suede finish and unexpected colour combo makes these such a great compliment to neutral 'fits for winter. New sneaker trends might be tempting, but these will never not look amazing.

Cendre Millie Earrings, were $75, now $52.50.

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Vintage-inspired earrings, or "grandma earrings", as I like to call them, add such a cool finishing touch to casual looks. I've been into this trend since I saw Hailey Bieber embrace big gold earrings last year, wearing them with her athleisure looks and suiting separates.

NA-KD Wire-frame sunglasses, were $25.95, now $10.38.

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10 bucks for these sleek aviators? Say less. I've been wanting a pair of wire-frame shades but didn't want to invest too heavily, so this option from the Swedish high street brand is right on the money.

Poppy Lissiman Lio Tote, was $210, now $94.50.

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This bold design by the cult Australian accessories brand has been on my wishlist for yonks. The shape makes it a great everyday bag, and the statement print will always make it a joy to carry - no matter how gloomy the weather might be.

Shop more Afterpay Day fashion deals.

MNG Striped Polo Neck Sweater, was $99.95, now $69.95.

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Cotton On Plush Essential Half Zip Jumper, was $49.99, now $34.99.

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MNG Straight Knitted Trousers, were $109.95, now $79.95.

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Jag Monstera Maxi Dress, was $250, now $79.20.

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Jag Bella Linen Dress, was $180, now $144.

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Cos Oversized Draped Double Breasted Blazer, was $260, now $130.

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Cos Oversized Chunky Hoop Earrings, were $69, now $48.

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Only Hallie Quilted Jacket in Seashell Leo, was $89.95, now $62.97.

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Piper Petites Wide Leg Denim Jean, was $99.95, now $59.97.

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Tussah Jaydah Knit Dress, was $129.95, now $77.97.

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Dazie London Fever Denim Shacket, was $99.99, now $59.99.

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Afterpay Day fashion offers.

ASOS: Up to a combined 70% off + additional 15% off on March 20-21

The Iconic: 25% off (discount applied at checkout)

David Jones: Save up to 25% on selected full-priced women's, men's, and kids' fashion

Seed: 20% off storewide

Culture Kings: Extra 25% off new season & sale (minimum 25-80% off with code: AFTERPAY)

JD Sports: Up to 40% off selected styles

P.E. Nation: 25% off online

Camilla: 70% off online warehouse sale

Cue: 15% off full-priced styles on purchases made with Afterpay

Veronika Maine: 15% off selected full-price styles

Assembly Label: Up to 40% off select styles

Converse: Additional 40% off all sale styles with code EXTRA40

Adidas: 30% off storewide within outlet stores

Novo Shoes: 25% off sitewide

Footlocker: Up to 70% off

New Balance: Up to 30% off selected styles

Dissh: Additional 20% off sale items

You can find more information about Afterpay Day at the official page.

Note: Discounts may vary and terms and conditions apply.

Feature image: Supplied.