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The Handbook

How To Buy A Suit Online

There are few things more important for your working wardrobe than investing in the perfect suit. Fit, form and finesse make up the golden ratio of suiting, and nothing demands attention to these details more than the purchase of an off-the-peg suit. With our expert advice, buying a suit online will be a cinch...

How to buy a suit online

Where To Start

First up, take your measurements. It may sound obvious but it's always worth taking the time to be precise - especially when making an online purchase. Even if you're confident in your suit size, many brands will differ in their styles and cuts. Our handy Harrods menswear size guide should help with the sizing conversions.

  • How To Measure Up

    Measure up on your chest - from armpit to armpit, inside leg and waist. Meera Pandya, designer and tailor at Harrods of London, explains: "Measure your waist, then try on your most comfortable or favourite pair of trousers and compare the measurements. This will be more realistic and you can get your ideal waist measurement."

  • How To Buy A Suit Online
  • How To Buy A Suit Online
  • "It's fundamental to know your sizes, what fits you best and to look at the texture to understand the exact type of fabric you are choosing."

"Most suits come with a generated Drop system, for example, Drop 6 would be that the jacket size is 40 and the trouser size is 34 (take trouser size from jacket size), which may not be your exact spec, so make sure you have a handy tailor you can go to for alterations if needed," she adds

"It's fundamental to know your sizes, what fits you best and to have a look at the texture to understand the exact type of fabric you are choosing. As for the model, go for something you are confident with while leaving the more unconventional styles for shopping in-store," recommends top Italian tailoring brand Canali, while Savile Row tailors Gieves & Hawkes suggest: "Go for a suit company that you know and trust. A model name always helps if you have had them before. Have your basic measurements on file and be best friends with an experienced tailor."


  • "Classic, Modern or Slim?"
  • How To Buy A Suit Online
  • How To Buy A Suit Online

Think about your body shape also when measuring up, and familiarise yourself with the different sizing out there. The fit or style is fundamental in complementing your natural silhouette and making the suit work for you. So how do you know which fit to go for? Canali suggests: "A slim fit tends to follow the body’s contours and generally has trimmer features, including lapels and leg openings, as well as a shorter jacket length. A modern fit suit also has a slim silhouette, but with slightly more room, narrower shoulders and a higher armhole, while a classic fit is the most traditional of the three, allowing for more room in the shoulders and body." And to fit certain body types, they add: "For men with broad shoulders, lighter colours tend to narrow the frame. Shorter men should avoid long jackets, while tall men might find that two-button jacket styles work better. One of the most important factors is the fit of the shoulders as this is the hardest part to tailor."

Gieves & Hawkes recommend: "Short chaps should go for something with a stronger shoulder. Taller guys can get away with the current cropped jacket trend and a softer shoulder on the coat."

A single-breasted, two-button suit is the style most popular as it suits most body shapes - get it right and it'll be your sartorial second skin. For a more formal take, opt for a single button. Double-breasted jackets need careful consideration to avoid looking awkward or even a little old fashioned. They should always be cut short and trim for a more relevant, contemporary look.

How To Buy A Suit Online

How Should It Fit? 

When you get to try on your suit at home, the first thing to do is be realistic - it may not be the perfect fit in all places at this point, but that's why it's recommended to have a tailor on speed-dial, for any nip, tucks and alterations required to finesse your final look. Here's what to check for...

A. Shoulders - Essential in setting up the overall silhouette of the jacket, the shoulders can make or break the sharpness of a suit. To get the perfect fit, this may actually mean dropping down a size depending on the brand or cut of the suit. The fit on the shoulders should be snug, the shoulder pads shouldn't extend beyond the shoulder and when buttoned up, should pull you into a straighter posture. 
B. Lapels - The insides of the lapels should sit flat against your chest - if there's a gap it's likely the jacket is too tight in the chest or across the waist. Match the width of your lapel with the width of your tie to balance up the look.
C. Sleeves - These should add to the streamlined fit of your suit. They shouldn't be too wide or sag or gape with excess fabric. It may be the case that once you have the right fit across your shoulders and chest, you will want your sleeves adjusted by your tailor.
D. Chest - From armpit to armpit, then down and across your torso, the jacket should sit comfortably either buttoned up - with no gaping or pulling - or left open and still retain its shape. It should sit flat on the chest, skimming your waist and hips, adding definition.
E. Cuffs - As with the sleeves of the jacket, the cuffs will add a final polish to the look. Too long and they look untidy, too short and they can make arms look stilted. The perfect cuff is cut just grazing the wristband allowing for a stylish one-centimetre glimpse of your crisp shirt below.
F. Buttons - Depending on whether double-breasted, one button or two, it shouldn't gape or pull at the point of fastening. It should sit flat, comfortably across your waist. 
G. Trousers - The fit of the trousers are key to complementing the sharp silhouette of the jacket. They should be slim cut, fitted at the waist, yet allowing for two fingers fit when buttoned up to ensure the waist isn't under too much strain. Trouser breaks should sweep the top of the shoe, with the back hem sitting lower than the front, to allow for natural movement when walking and avoiding too much of a rise when seated. You may also opt for turn-ups on the trouser hems - which work best with a slimmer cut. Meera explains: "Most suit trousers online come unfinished, which is great as you can get your ideal length and break which should be no more then 7/8th of inch for a clean sartorial finish. If the suit you've selected is finished, again, know your leg length when trying and measuring."

Waistcoats - If you choose to add a waistcoat to your look, Gieves & Hawkes suggest: "Your waistcoat shouldn’t pull at the buttons but should give a flattering silhouette through the waist. Most waistcoats (or vests in the States) come with a strap and buckle on the back to adjust after a big lunch."

How To Buy A Suit Online

Fabric & Pattern

When it comes to selecting fabric and pattern, aside from personal taste, it's important to think about for what type of occasion the suit will be worn, the season you'll be wearing it in and if it will be a real mainstay in your wardrobe for everyday or something that little bit more special.

"My advice is to stick with solid-colour suiting fabric rather than patterns since it's hard to see exactly how stripes or a pin dot can be on a computer screen. A flat plain can be a safe bet and a classic buy," advises Meera. "Our great SB2 fashion suits in a grey or subtle linear checks are ideal for work with a touch of trend. However, if you feel the need for something more snazzy - then go for our beautiful Italian window check, double-breasted suit which is a must for the season," she adds.

When it comes to season and occasion, Canali suggests: "For autumn/winter, Canali is focusing on fine, super-soft wool felts and flannels to provide lightweight warmth. The occasion is just as important – formal events might call for a more decorative fabric like velvet, but crafted into a contemporary design."

For a suit that works all-year round, Meera recommends: "Most guys now need a wardrobe full of suits to transcend the seasons – resistant fabrics like our Harrods of London Zealander suits are great for durability and for everyday travel as the fabric doubles as travel-resistant cloth while keeping the fine micron quality."

How To Buy A Suit Online

The Finishing Touches

Never underestimate the power of the polish - it's those finishing touches that will add that final finesse to your look. Matching a pocket square to a tie in a complementary shade is a great way to balance out your look, while opting for a knitted slim tie adds a more modern edge.

Keep your layers in proportion to your suit. If it's a slim, contemporary cut, make sure your shirt collar is slender and your tie, slim. If it's a more classic cut, opt for a more classic collar on your shirt. 

And don't forget footwear. The key to completing your look has to be a pair of sleek, well-shined leather or pristine suede brogues, Oxfords, monk straps or loafers.