A linen shirt should sit flat on the shoulder seam, allow a flat palm to slide comfortably across the chest, and end somewhere between the mid-fly and the base of the pocket. Linen drapes away from the body rather than clinging, so it needs slightly more room than a cotton shirt in the same size. The Thomas Scott linen shirts range is offered in slim and relaxed cuts for exactly this reason.
Fit is the single biggest reason men return shirts bought online, and linen makes it harder because the fabric behaves differently from cotton. A slim linen shirt does not hug the way a slim cotton shirt does. Understanding that difference before you order saves an exchange. Everything below applies whichever brand you buy from, though the measurements referenced are from the Thomas Scott linen collection and the Thomas Scott store.
The Five Checkpoints
|
Checkpoint |
What correct looks like |
Warning sign |
|
Shoulder seam |
Sits on the bone at the edge of your shoulder |
Seam drooping down the arm, or biting into the shoulder |
|
Chest |
Flat palm slides in easily with the shirt buttoned |
Fabric pulling into horizontal lines across buttons |
|
Armhole |
High enough to raise your arm without the whole shirt lifting |
Hem rising sharply when you reach forward |
|
Sleeve length |
Ends at the wrist bone |
Cuff sitting over the hand, or above the wrist |
|
Shirt length |
Covers the belt and stays tucked when you move |
So short it untucks, or long enough to look like a tunic |
Why Linen Needs Different Room
Linen has almost no stretch. Cotton and cotton-elastane shirts give a little as you move, so a snug fit still feels acceptable. Linen does not give it either fits or it strains. A linen shirt cut too close will show pull lines at the chest and shoulder and will feel restrictive rather than merely tight.
Linen also has more body than cotton. It stands slightly away from the skin instead of following it. That is the property that keeps you cool, and it means a relaxed linen shirt looks intentional rather than oversized in a way that a relaxed cotton shirt sometimes does not.
The practical conclusion: if you are between two sizes in linen, take the larger one. If you are between two fits, take the more relaxed one.
Slim Fit Linen: Who It Suits
A slim fit linen shirt tapers gently through the waist with a narrower sleeve and a shorter overall cut.
Best for: leaner and average builds, tucked-in styling, smart-casual offices, wearing under a blazer, men who prefer defined lines.
Not ideal for: broad chests with a narrower waist (the taper fights you), untucked wear on a fuller frame, long humid days where you want maximum airflow.
Expect: a clean silhouette that still shows the soft creasing linen always shows. Slim linen is not the same as tight.
Regular Fit Linen: The Default
Regular fit sits straight through the body with a comfortable armhole and a standard sleeve.
Best for: most builds, most occasions, tucked or untucked, first-time linen buyers, all-day wear in heat.
Not ideal for: anyone specifically wanting a sharp tailored line under a jacket.
Expect: the most forgiving option and the easiest to style. If you are uncertain, this is the safe choice.
Relaxed Fit Linen: When to Choose It
Relaxed fit adds room through the chest and body, often with a wider sleeve and a slightly longer or boxier cut.
Best for: hot and humid days, coastal and holiday wear, fuller builds, untucked styling, layering over a t-shirt, anyone who dislikes fabric touching them in heat.
Not ideal for: formal settings, wearing under a fitted blazer, shorter frames who may find the extra length overwhelming.
Expect: maximum airflow and a deliberately easy silhouette.
Fit for Different Builds
Broad shoulders, narrow waist: fit the shoulder first, always. A shirt that fits the shoulder and is loose at the waist looks correct; a shirt that fits the waist and pulls at the shoulder never does.
Fuller midsection: choose regular or relaxed and check the shirt length carefully you want coverage that stays put. Avoid heavy tapering.
Slim build: slim fit prevents linen's natural body from reading as bulk.
Taller frames: shirt length is your key measurement, not chest. Check the garment length figure, not just the size letter.
Shorter frames: a slightly shorter hem and a narrower sleeve keep the proportions balanced.
How to Measure Yourself Properly
You need four numbers, taken over a thin t-shirt:
-
Chest around the fullest part, tape level, arms down.
-
Shoulder across the back from the edge of one shoulder to the other.
-
Sleeve from the shoulder edge, over a slightly bent elbow, to the wrist bone.
-
Length from the base of the neck at the back down to where you want the hem.
Then compare those numbers against the brand's garment measurements not against the size letter. A 40 at one brand is not a 40 at another. Thomas Scott lists garment measurements on each product page for this reason.
Common Fit Mistakes
Sizing up "because it's linen". Linen needs a little more ease, not a whole size. Pre-shrunk linen does not require compensation.
Buying by your usual size letter. Sizing varies significantly between brands. Read the chart every time.
Ignoring the armhole. It's the measurement nobody checks and the one that most affects comfort in heat.
Assuming creasing means bad fit. Linen creases when you sit. That is the fabric, not the fit.
Expert Tip
Do the reach test before deciding whether a shirt fits. Button it, then reach forward as if taking something off a desk. If the hem lifts sharply out of your waistband, the armhole is too low or the body is too tight. A correctly fitted linen shirt barely moves.
FAQs
Should a linen shirt be loose or fitted?
Slightly looser than an equivalent cotton shirt. Linen has no stretch and works best when it can drape rather than cling, which is also what keeps you cool. Fitted is fine if it means "clean lines" and not "close to the skin". Focus on the shoulder seam sitting correctly and enough chest room to slide a flat palm inside.
Should I size up in a linen shirt?
Only if you are genuinely between sizes then take the larger. Don't size up as a general rule. Quality linen is pre-shrunk, so you're not compensating for shrinkage, and an oversized linen shirt looks unintentional rather than relaxed.
How long should a linen shirt be?
For tucked wear, long enough to stay tucked when you raise your arms usually to around mid-fly. For untucked wear, the hem should finish somewhere between the top and the middle of your trouser pocket. Anything below the pocket base starts to look like a tunic.
Can I wear a slim fit linen shirt untucked?
Yes, provided the length is right. Slim fit linen shirts are often cut slightly shorter, which suits untucked wear well. Check the garment length on the product page rather than assuming, and make sure the hem clears your belt without extending past your pocket.
Do linen shirts get looser with wear?
They soften considerably but don't stretch out of shape the way knitwear does. The shirt will feel more comfortable after several washes because the fibre relaxes, not because the garment has grown. Buy the fit you want on day one.
