Accessories: no decent outfit is complete without them. They are what béarnaise sauce is to steak, butter to bread, an olive to a martini. You get the idea.

But sometimes it can be difficult to know just how good an investment any of these stylistic accoutrements might turn out to be (we’re looking at you, piano key tie and bottle opener belt buckle).

Fortunately, history has taken some of the trial and error out of the process; because if it looked good 50 years ago, and it looks good now, chances are it’ll look good for 50 more. Here are the 10 men’s accessories that will never go out of style.

Classic Sunglasses

Few things do a man more favours than a pair of sunglasses. Flattering, practical, and a dab hand at hiding dark circles when needed; glasses conjure up images of golden-age movie stars like Steve McQueen at the flick of a hinge.

It’s telling that the most popular styles have changed little over the decades. Aviators, Wayfarers and Clubmasters are all time-honoured staples that suit different face shapes. While twists on these stalwarts are more than welcome (a rounder, fuller Clubmaster will be deeply on-trend this summer), the overwhelming sentiment is that if it isn’t broke, don’t fix it.

Seeing as a decent pair of sunglasses will stick around for life, don’t be afraid to go north of the £100 mark. Just be sure to maximise longevity by keeping everything classic and understated with either black or tortoiseshell frames and brown, black, or dark green lenses.

(Related: The Best Sunglasses Brands For Your Money)

Men's Classic Sunglasses

RAY-BAN Original Wayfarer Acetate Sunglasses - Click to buyOLIVER PEOPLES Braedon Aviator-Style Acetate And Gold-Tone Polarised Sunglasses - Click to buyPERSOL 3114-S collezione suprema aviator sunglasses - Click to buyTOM FORD FT0248 HENRY SUNGLASSES - Click to buy

A Leather Billfold Wallet

Paying for a pint is now as easy as the swipe of a smartwatch. So it says something about the billfold wallet that it remains a stylish accessory even today.

Practical, moulded to the contours of its contents and aged to perfection over time, a leather wallet is an accomplice that will do the business long after the business has stopped accepting cash.

It’s for this reason that many men choose to have their note carriers embossed with their initials; a move that sets out intentions to keep it for life, even if what’s inside doesn’t make it to the end of the month.

Men's Classic Leather Billfold Wallets

Aspinal of London Billfold Wallet - Click to buyA.P.C. LONDON BIFOLD WALLET - Click to buyDUNHILL Boston Full-Grain Leather Billfold Wallet - Click to buyMULBERRY Full-Grain Leather Billfold Wallet - Click to buy

Stainless Steel Watch

The understated, no-nonsense cousin of the gold watch, a stainless steel timepiece has the ability not only to last one lifetime but several if handed down through successive generations.

The material that has its roots in gun making is as flattering as it is durable. It’s also equally at home with a suit and tie as it is a T-shirt and chinos combination.

Even half a century from now, when there’s a clock face embedded into contact lenses and a calendar built into most retinas, truly stylish men will still look to their steeled wrist when someone asks for the time.

(Related: The Best Steel Watches For Men)

Men's Classic Steel Watches

Seiko Men's Black Dial Stainless Steel Bracelet Watch - Click to buyMONDAINE A6273030311SBB Evo Big Size stainless steel watch - Click to buyuniform wares M42 Men's chronograph watch - Click to buyTAG HEUER Aquaracer Alarm stainless steel watch - Click to buy

Leather Belt

A good belt does more than simply hold your trousers up – it also holds a look together. Whether a much-needed divide for tall men between the top and bottom halves on an outfit or a subtle compliment to leather shoes, a decent cowhide belt will endure long after other accessories have gone out of style.

(Related: 6 Rules For Wearing Belts Like A Boss)

Choose brown, black or (better yet) one of each, and always opt for the best you can afford. This thing will be holstering your trousers for many years to come, and you wouldn’t want to be unseated by a crumbling imitation number. Subtle, classic buckles in unprocessed metallic tones will also stand you in good stead.

Men's Classic Belts

reiss THEO GRAINED LEATHER BELT - Click to buyHUGO BOSS Barnabie leather belt - Click to buyPOLO RALPH LAUREN 3cm Dark-Brown Leather Belt - Click to buyted baker REVA Reversible textured leather belt - Click to buy

White Pocket Square

Any formal ensemble can be lifted by the accessory that has served the suited since around the 1920s. From Frank Sinatra and Humphrey Bogart to Tom Ford and Daniel Craig, the white pocket square is an accessory for the ages (and all ages).

(Related: The Complete Guide To Men’s Pocket Squares)

Whatever mood or message you wish to convey, there’s likely to be a pattern or print to do so. However, what an unfussy white version delivers is a quiet confidence that speaks volumes at any event, from black tie dos to weddings.

Men's White Pocket Squares

ct White silk evening pocket square - Click to buysuitsupply WHITE POCKET SQUARE - Click to buyTURNBULL & ASSER Silk Pocket Square - Click to buyDRAKE'S Silk-Twill Pocket Square - Click to buy

Leather Holdall

Is there any name in the world of fashion more winning than ‘the weekender?’ A bag reserved for the best time of the week, a friendly porter for an adventure, and the container of the wardrobe’s greatest hits. The weekend bag – or leather holdall – is an enduring favourite of the menswear arsenal.

(Related: 6 Accessories Every Man Should Own)

As with most leather accessories, favour simple black or brown (or, in defiance of the rules, a mixture of the two), or a faded olive shade for a more contemporary take.

As well as colourways, look to experiment with texture. Supple, smooth calfskin is a sleek choice, while a fuller, more tactile pebble grain lends a rugged, jet-set feel to any getaway outfit.

Men's Leather Holdall/Weekender Bags

John Lewis Tokyo Leather Holdall - Click to buyM&S COLLECTION Pebble Grain Leather Holdall - Click to buyAspinal of London Harrison Small Weekender - Click to buyMULBERRY Clipper Leather Holdall - Click to buy

Silver Cufflinks

Tailored suit, check. Egyptian cotton shirt, check. Lucky Hermès tie and sturdy English brogues, double check. Why then would you spoil it all by finishing things off with a pair of cheap knots given away for free in the suit shop? A minor detail, yes, but all the most important ones are.

Get it right every time with a pair of well-made, understated silver cufflinks. Silver is an astute choice for every hue of shirt, and for any occasion. Better yet, silver cufflinks don’t distract from a watch or razor-sharp cuff line in a way that gold or bejewelled versions might.

(Related: 6 Pieces Of Jewellery Any Man Can Wear)

Men's Silver Cufflinks

Hammond & Co. by Patrick Grant Silver textured circular cufflinks - Click to buyJohn Lewis Laser Engraved Cufflinks - Click to buyAlice Made This Edward cufflinks - Click to buyLANVIN Brushed Silver-Tone Cufflinks - Click to buy

Baseball Cap

Is there an item that signals ‘man at leisure’ better than the baseball cap? We’re not talking about the flat-peaked, oversized, gold-studded sort; but the soft, round-brimmed, sporty staples that have invaded even the most conservative of wardrobes. Picture John F. Kennedy on a yacht, or Paul Newman sidling off a race track.

(Related: How To Wear A Hat Without Looking Like A Fool)

The specifics here are up to the individual wearer. Bright colours – especially once sun faded – can look just as pleasing as muted tones, and a bit of subtle embroidery or branding is just as winning as a pared-back, no-logo design.

Men's Baseball Caps

REIGNING CHAMP 6-PANEL CAP - Click to buyWOOD WOOD LOW PROFILE CAP - Click to buytopman Khaki Curved Peak Cap - Click to buyEBBETS FIELD FLANNELS Cotton-Twill Baseball Cap - Click to buy

Tartan Scarf

In many ways, scarves are the perfect accessory. In the depths of winter, they can be used to fend off piercing winds, while in the milder months they can add a hint of colour, not to mention show you know how to layer, to any lapel or neckline.

Few patterns do more for the male wardrobe than sparingly-used (outside of Scotland, anyway) tartan. The marriage of multiple colours in a single weave allows the tartan scarf to complement and contrast with different elements of a wider outfit.

The sheer variety of checks available means a tartan neck piece can also be all things to all men: stark red and black for a modish, striking look; deep greens and blues for a classic, preppy feel.

(Related: 9 Fabric Patterns Every Stylish Man Should Know)

Men's Tartan Scarves

jaeger Wool Highlight Check Scarf - Click to buyJohn Lewis Richmond Cashmink Check Scarf - Click to buyBURBERRY Giant check cashmere scarf - Click to buyJohnstons of Elgin Cashmere Scarf - Click to buy

Leather Gloves

Leather’s supple, skin-like properties make it the perfect material in which to wrap your hands. A far cry from clumsy woollen mittens of childhood years, leather gloves offer dexterity and durability alongside warmth and comfort – particularly when lined with cashmere.

(Related: 10 Classic Pieces That Should Be In Your Winter Wardrobe)

Leather gloves also represent a more elegant option that can work alongside formalwear as well as chunkier winter-battling outfits, while their subtly sporting roots (think driving and shooting) give them a sleeker, more debonair feel than their woollen counterparts.

Men's Leather Gloves

J.LINDEBERG Milo dark brown leather gloves - Click to buyted baker CALYPSO Leather ribbed cuff gloves - Click to buyMR. START Wool Lined Leather Gloves - Click to buyDENTS Bath Cashmere-Lined Leather Gloves - Click to buy