How Do I Know if a Shirt Fits Me? 7 Checks in the Mirror

6 min read · WORN

How do I know if a shirt fits me? Check five spots in the mirror: the shoulder seam sits at the edge of your shoulder, the chest doesn't pull, the hem hits around your mid-zip or hip, the sleeves end where they should, and you can lift your arms without it riding up. Oversized is the exception, and it has its own rules below.

If you have a pile of shirts you bought, tried and never wore because something felt off, WORN would show you which ones you skip and which fits you really live in. Start my outfit diary

The 7-point fit check

Stand in front of a full-length mirror in good light. Wear the shirt the way you'd actually wear it (tucked, untucked, layered). Then go through this list. It works for tees, long sleeves, hoodies and button-ups.

1. Shoulders: seam sits at your shoulder edge.
2. Chest: no pulling, no X-shaped creases.
3. Stomach and waist: smooth, no clinging or big tent.
4. Length: right for how you'll wear it.
5. Sleeves: the right spot on your arm.
6. Neckline: lies flat, no gaping or choking.
7. Movement: arms up, arms forward, sit down. Still okay?

Pass 6 or 7 and it fits. Pass 4 or fewer and it's going back.

A "fit check," by the way, is just showing your whole outfit, usually in a mirror video. This is the private, honest version.

Shoulder seams

The shoulder is the hardest part to alter, so it matters most.

How to know if a shirt fits your shoulders

Find the seam where the sleeve joins the body.

• Seam at the bony edge of your shoulder: regular fit, perfect.
• Seam creeping up onto the top of your shoulder: too small.
• Seam a little down your arm: relaxed or boxy. Fine if that's the style.
• Seam halfway to your elbow: either it's designed oversized (drop shoulder) or it's too big.

Shoulder seam placement is the quickest single test for how a shirt should fit.

Chest and stomach

How do I know if a shirt is too small?

T shirt too tight signs:

• Lines pulling from the chest toward the armpits.
• Buttons gapping on a button-up (you can see between them).
• The fabric shows every curve of your stomach or chest when you didn't want it to.
• It rides up when you sit.
• You feel it across your back when you reach forward.

How do I know if a shirt is too small for me, even if it's my usual size? Brands vary a lot, and shrinkage happens. If it used to fit, read how do I know if a shirt will shrink.

How do I know if a shirt is too big?

• Fabric balloons around your stomach when you tuck it.
• The armholes hang way below your armpits (and it's not a designed boxy cut).
• The hem goes past your hips in a way that shortens your legs.
• You can pinch more than a couple of inches at each side of your chest.

Length

How long should a shirt be? Depends on how you wear it.

Shirt length guide tip: lift both arms over your head. If your stomach shows and you didn't want it to, it's too short.

Sleeves and neckline

Sleeve length check

• Short sleeve tee: mid-bicep. Slimmer fits sit a bit higher.
• Long sleeve tee or hoodie: reaches your wrist bone, maybe a little bunching.
• Button-up: cuff hits where your hand meets your wrist, with arms hanging.
• Sleeve width: you should be able to fit a finger or two between your arm and the sleeve.

Neckline

A crewneck should sit flat at the base of your neck without gaping or feeling like it's choking you. On a button-up, you should fit about one finger in the collar when it's buttoned.

Here's where it gets tricky: a shirt can pass every check and still never get worn. Fit on the hanger and fit in real life are different. WORN keeps a one-photo-a-day diary and, after a month, shows which shirts you actually reach for and which never leave the drawer. Start my outfit diary

Oversized on purpose vs too big

Oversized shirt vs too big is the question for most of Gen Z, because oversized is the default now.

It's oversized on purpose if

• It's labeled oversized, boxy, relaxed or drop shoulder.
• The shoulder seam drops, but the neckline still sits right.
• It's wider, not just longer.
• The sleeves end around your elbow on a tee.
• It looks balanced with your bottoms (fitted or straight bottoms with a big top; or a matching wide leg for a full baggy look).

It's just too big if

• The neckline gapes or slides off a shoulder.
• It's long enough to be a dress (unless that's the look).
• The fabric is thin and it collapses instead of draping.
• Sizing down would look the same but neater.

Shirt fit for guys and shirt fit for girls follow the same logic. Fitted means seams on your edges; oversized means designed drop and width.

Checking fit when buying online

How to know if a shirt fits without trying it on? Use a shirt you already love as your measuring stick.

1. Lay your best-fitting shirt flat.
2. Measure pit to pit (across the chest, armpit to armpit). That's the number that matters most.
3. Measure length from the highest point of the shoulder to the hem.
4. Compare to the size chart. Most shirt size charts list garment measurements, not body measurements. Check which one it is.
5. Read reviews for "runs small" or "runs big."
6. Check fabric. 100% cotton can shrink a bit; polyester blends usually don't. Here's how to tell if clothes are polyester.

That's how to measure a shirt in two minutes, and it beats guessing every time.

Know which shirts really fit your life

How do I know if a shirt fits me? The mirror tells you on day one; your outfit history tells you for real. WORN is a waitlist for a private outfit diary: one tap, one photo a day, no cataloguing. After a month it reads back the pieces you really wear, the ones you never touch, and suggests tomorrow's outfit from your own clothes.

Start my outfit diary

FAQ

How should a t shirt fit for guys?

Shoulder seams at your shoulder edge, sleeves around mid-bicep, hem around mid-fly, and no pulling across the chest. For oversized, go for a designed boxy cut instead of just sizing up.

How do you know if a shirt fits well across the chest?

Look for smooth fabric with no X-shaped creases or pulling toward the armpits. You should be able to reach forward without feeling it tighten across your back.

How can I tell if a shirt is too big or just oversized?

Designed oversized shirts have dropped shoulders but a neckline that still sits right. If the neck gapes, it slides off your shoulder, or it collapses on you, it's just too big.

How do I know my shirt size without trying it on?

Measure a shirt that fits you pit to pit and top to hem, then compare with the brand's size chart. Reviews that say "runs small" or "runs big" help too.

What's the fastest fit check for a shirt?

Shoulder seam, then arms up. If the seam sits on your shoulder edge and the shirt doesn't ride up when you lift your arms, you're most of the way there.