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When the weather starts shifting, so too should your wardrobe.

Although there is a singular day that marks the start of spring, when it officially feels like spring is rather fluid. For those that experience all four seasons, spring can pack them all into one day — it could be warm in the afternoon but have rained around lunch and been below freezing earlier in the morning. As such, dressing for the season requires a little bit of guessing. But you can still prepare your wardrobe, regardless of the irregularity.

Just like how winter weather has its parkas and puffers, the inconsistent spring climate comes with own essentials, too. You need layers, pants that breathe but also trap your body heat and smarter and lighter footwear, because while yes, it might hit the mid-70s, the evenings could dip into the high-30s or low-40s.

Below, you'll find your basics: a long sleeve T-shirt, a denim jacket, jeans and chinos. But a few unexpected items, too, that are absolutely essentials as well.

This is Outerknown's best-selling Groovy Pocket T-shirt, but long-sleeve. It's cut from 100-percent organic cotton, comes in seven colors, and fits perfectly.

For when short-sleeves, well, fall short.

The first iteration of Levi's classic Trucker Jacket came in 1905, when the Type I Levi's Blouse debuted. The Type III celebrated its 50th birthday in 2017, signaling the style's successes (and several evolutions). Plenty of jackets on this list take cues from Levi's original cuts, but the original remains a must-buy — and, oftentimes, a bargain.

From Levi's category-defining trucker to stunning selvedge options, these are the best everyday denim jackets.

This isn't your typical tortoise frame. The pattern's oversized, and the lenses are green polarized ones by Carl Zeiss, plus the fit is wider. They also offer 100 percent UVA and UVB protection.

Sunglasses strategy: accentuate your best features. We break down the best shades for every face shape.

Outerknown's collection of S.E.A. Jeans emphasize sustainable manufacturing. The organic cotton comes from the Candiani mill in Milan, Italy, and each pair is made by Saitex, an innovative, eco-friendly Vietnamese factory. Plus, every pair comes with a lifetime guarantee.

From classics like Levi's, Wrangler and Lee to newcomers like Everlane, The Feel Studio, and Frame.

Made from organic French terry that’s tightly spun for added durability, this hoodie features triple-needle coverstitching along the seams but no drawcords. It has a 365-day guarantee, so if anything goes wrong, Everlane will replace it free of charge.

This 27-inch long umbrella has a handmade curved maple wood handle and a waterproof recycled PET shell. It's sturdy, stylish and straightforward. Plus, it sits in a sweet spot between too cheap and way too expensive.

From the affordable and durable to the exquisitely crafted, these are some of our favorite umbrellas.

Designed for Daniel Craig's James Bond in Casino Royale, this shirt is made from breathable, soft cotton mesh. The design features a chest pocket, side slits and tonal buttons. It fits well and it feels rather durable.

It's difficult to imagine a world without this elevated sportswear essential. Pick up your next go-to now.

As the name suggests, Thrills' Minimal Work Jacket is, well, minimalist. It's straight-fitting, has two hidden hip pockets and a pen/tool stash on the sleeve. The zipper runs the length of the jacket, and the collar is tight and tidy. Simple, and easy to match.

Unlined, open-front jackets that won't make you overheat.

The upgrade to J.Crew's 774 from Dickies' 574 is about more than material. J.Crew’s popular Classic Relaxed Fit Chino goes a few steps further in quality with a lined waistband and chambray binding at the seams. Also, they come in the full spectrum of colors.

Denim does the job, but you can't survive on jeans alone. Swap them out for chinos from one of our favorite brands.

No sneaker looks better beat up than the Chuck Taylor All Star. But, to ensure you get more than a year out of 'em, you should upgrade to the Chuck 70, a modern rendition of the iconic sneaker made with sturdier canvas uppers, an enhanced rubber outsole and a cushioned insole. These will wear nicely, even after they've earned their fair share of scuffs. (Note: I've been wearing the same pair for five years...)

White sneakers are an annual signal nicer weather has arrived (or is at least on its way).