Men's Guide to Shirt Sizing and Better Fits

A great shirt can carry the whole look, but only when it fits with intent. This men's guide to shirt sizing cuts through the guesswork, so your bold print, crisp Oxford or refined plain shirt looks as considered on you as it did on the hanger. The right size is not about squeezing into the smallest label or hiding in excess fabric. It is about clean lines, easy movement and proportions that let your personal style do the talking.

Start with your measurements, not your usual size

Sizing varies between brands, shirt cuts and countries. A medium in one collection can feel like a large somewhere else, especially when you move between relaxed holiday shirts, tailored office styles and structured Oxford cloth. Your best starting point is a tape measure and a shirt you already wear well.

Measure your neck around its base, where a collar naturally sits. Keep the tape comfortably close rather than tight, then add enough room to breathe and move. For a buttoned-up formal shirt, you should be able to fit two fingers between your neck and the fastened collar. If you generally wear your shirt open, collar comfort still matters: a collar that is too large loses its shape and can make an otherwise sharp shirt look careless.

Next, measure the fullest part of your chest, keeping the tape level and relaxed. This is usually the most useful body measurement when choosing a shirt. If you are measuring a shirt rather than yourself, lay it flat, button it up and measure straight across the chest just below the armholes. Double that figure to compare it with the garment's stated chest measurement.

Your waist is worth checking too, particularly if you prefer a more streamlined silhouette. Measure around your natural waist, not where your trousers happen to sit. Men with a broader chest and narrower waist often find a tailored cut gives them the cleanest shape, while those who value extra comfort through the middle may be better served by a regular fit.

A men's guide to shirt sizing by fit

The number on the label tells only part of the story. The fit determines how the shirt sits on your frame, how it moves and what sort of occasion it suits.

Slim fit

A slim-fit shirt follows the body more closely through the chest, waist and sleeves. It should look defined, not strained. You want enough room to reach forward, sit down and lift your arms without buttons pulling apart or the back tightening across your shoulders.

Slim fits work particularly well if you favour a neat, contemporary profile under a blazer or with tailored trousers. They also allow a statement print to look deliberate rather than busy. The trade-off is less spare room, so if you are between sizes, have a developed chest or prefer a little more ease, size up or choose a more relaxed cut.

Regular fit

Regular fit is the versatile middle ground. It offers more space through the torso than a slim shirt without falling into oversized territory. The shoulders should still sit correctly, while the body should skim rather than cling.

This is often the most adaptable option for everyday wear. A regular-fit printed shirt can look polished with chinos and loafers, then relaxed with denim and trainers. It is also a sensible choice if you are buying your first bold shirt and want an easy, confident silhouette.

Relaxed fit

Relaxed-fit shirts are designed with more room in the body, sometimes with a wider sleeve and a slightly shorter, straighter hem. They suit warmer days, open-collar styling and a less formal approach to dressing. Extra room should read effortless, not oversized by accident.

Pay closer attention to the shoulders here. A relaxed shirt may have a touch more ease, but the shoulder seam should not slump far down your upper arm unless the garment is intentionally designed that way. When the shoulders are too wide, even the most distinctive design can lose its structure.

Check the five points that make or break a shirt

A shirt can technically button up and still be the wrong fit. These five checks reveal more than the size label ever will:

• Shoulders: The shoulder seam should finish near the edge of your shoulder. If it sits high towards your neck, the shirt is too small. If it drops well down the arm, it is too big.
• Chest: Buttons should lie flat. Horizontal pulling lines or gaps between buttons mean there is not enough room across the chest.
• Collar: When buttoned, it should sit comfortably against the neck without pinching or gaping.
• Sleeves: Long sleeves should end around the wrist bone. Too short looks awkward under a jacket; too long creates bunching at the cuff.
• Length: A shirt designed to tuck in needs enough length to stay put when you raise your arms. A casual shirt worn untucked should usually finish around the mid-fly area, rather than covering most of the seat.

Let the collar and cuffs set the tone

Collar size is functional, but collar shape is style. A structured collar can sharpen a plain shirt for work or an event, while a more relaxed collar works naturally with an open neck and expressive print. If you often wear a tie, make sure the collar closes comfortably before committing. If ties are not part of your wardrobe, focus on how the collar frames your face when worn open.

Cuffs deserve the same attention. They should rest at the wrist without sliding over the hand or riding several centimetres above the wrist bone. When wearing a jacket, around 1 to 1.5 centimetres of cuff showing is a useful guide, not an unbreakable rule. Longer arms can make off-the-peg sleeve lengths tricky, so look for brands that provide garment measurements rather than relying on small, medium and large alone.

Choose shirt length for how you will wear it

One of the most common sizing mistakes is choosing a shirt solely by chest or collar and ignoring its length. Formal shirts are usually cut longer through the body because they are made to be tucked in. Worn loose, they can look long and dated. Casual shirts tend to have a shorter hem and are better suited to untucked styling.

A curved hem is generally more forgiving when tucked in, while a straight hem often signals that the shirt is designed to sit neatly over trousers or shorts. There is no hard rule, though. The test is simple: if you wear it untucked, it should look purposeful from the side and back, not like it has escaped from a suit.

Print placement also changes how length reads. Larger patterns and strong geometric designs draw the eye, which makes a clean fit especially valuable. Too much excess fabric can distort the print and add visual bulk. A shirt that sits cleanly across the shoulders and chest lets the design keep its impact.

When you are between two shirt sizes

If you fall between sizes, prioritise your shoulders and chest. A tailor can take in the waist or shorten sleeves relatively easily, but adding room across the shoulders is rarely worth the compromise. If the smaller shirt fits your torso but pulls when you move, choose the larger size and refine the fit if needed.

Fabric matters here. Crisp cotton poplin and Oxford cloth tend to hold their shape, while softer fabrics may feel more forgiving. A short-sleeve shirt also needs its own assessment: the sleeve should sit comfortably around the upper arm, with enough room to move but no wide flare that makes the arm look lost inside it.

Always check the specific garment's size guide before ordering, especially for a design-led shirt where the intended fit may be part of the character. At Blake Mill, the shirt should feel like an extension of your style, not a compromise you have to keep adjusting.

The best size is the one that lets you forget about fit once you leave the house. When the collar sits right, the shoulders are clean and the proportions feel balanced, you are free to wear the shirt with the confidence it was made for.