Buying a T-shirt online is convenient.
But there is one obvious problem.
You can't try it on.
You can't feel the fabric. You can't check how the shoulders sit. You can't see whether the sleeves fall where you want them to.
So how do you know whether the T-shirt you're looking at will actually work?
The answer is to stop relying on the size label alone.
When buying online, you need to evaluate the measurements, proportions, fabric, construction and fit description before you buy.
Don't start with S, M, L or XL
The first mistake people make when shopping for clothing online is choosing the same size they normally wear.
Unfortunately, an M from one brand can fit very differently from an M from another.
Even within the same brand, different silhouettes can have different proportions.
Instead of asking:
"I normally wear M. Should I order M?"
Ask:
"What are the actual measurements of this garment?"
Step 1: Measure a T-shirt you already own
This is one of the easiest ways to reduce the guesswork.
Take a T-shirt that fits you well and lay it flat on a surface.
Then compare its measurements with the brand's size chart.
The most useful measurements are usually:
- Chest width
- Shoulder width
- Body length
- Sleeve length
You don't necessarily need to know your body measurements perfectly.
Comparing a garment you already like with the garment you're considering can often give you a much clearer reference.
For a more detailed sizing process, read our guide on how to choose the right T-shirt size online.
Step 2: Understand what the measurements actually mean
Chest
Chest width tells you how much room the T-shirt has across the body.
If your current T-shirt fits comfortably, comparing its chest measurement with the new garment can help you determine whether the new one will feel tighter or more generous.
Shoulders
Shoulder width has a major effect on how a T-shirt looks.
Too narrow and the garment can feel restrictive.
Too wide and the silhouette can look unnecessarily loose.
Body length
Body length is particularly important when buying online because a T-shirt can fit well around the chest but still look wrong if it's too long or too short.
Sleeves
Sleeve length and opening affect the overall silhouette.
Compare these measurements with a T-shirt you already like rather than relying only on descriptions such as "regular fit".
Step 3: Understand the fit description
Words such as regular fit, slim fit, relaxed fit and oversized are useful, but they aren't universal measurements.
A regular fit from one brand can be slightly different from a regular fit elsewhere.
That's why the fit description should be used together with actual measurements.
For RARE STAG, the current T-shirt collection is built around regular-fit silhouettes.
If you're unsure what a regular fit should look like, see our complete men's T-shirt fit guide.
Step 4: Look beyond the product photograph
Product photography is useful for understanding the overall appearance of a T-shirt.
But photographs don't tell you everything.
A garment can look excellent in a studio photograph while feeling completely different when worn.
Before buying, look for information about:
- Fabric composition
- Fabric weight
- Fit
- Construction
- Finishing
- Model measurements
- Size worn by the model
The more information a brand provides, the less you're forced to guess.
Step 5: Understand the fabric before ordering
You can't physically touch the fabric through your screen, so the product description becomes important.
Look beyond simply seeing the word "cotton".
Where possible, understand:
- Fibre composition
- Fabric construction
- Approximate weight
- Finishing
Two cotton T-shirts can have very different textures, structure and durability.
Our article What Makes Good Cotton Actually Better? explains why the word "cotton" alone isn't enough.
Step 6: Don't obsess over GSM
GSM is useful information, but it isn't a complete quality rating.
A higher GSM generally means a heavier fabric, but heavier doesn't automatically mean better.
The appropriate weight depends on the garment and how you intend to wear it.
For more context, read Why a Heavyweight T-Shirt Feels Different.
Step 7: Look at the neckline
When shopping online, the neckline can be easy to overlook.
But it's one of the details that has a significant effect on how a T-shirt looks over time.
Look for clear information about the neckline and examine product photographs closely.
A clean crew neck is particularly versatile because it can work across casual and smart-casual outfits.
Learn more about why the crew neck remains so versatile.
Step 8: Check how the garment is constructed
If you're buying a more expensive T-shirt online, don't stop at the front photograph.
Look for close-up images or product information showing construction details.
Check whether the brand explains anything about:
- Seams
- Stitching
- Neck rib
- Fabric finishing
- Shrinkage control
These details can help you understand whether you're buying a thoughtfully constructed garment or simply paying for appearance.
Our guide to what makes a T-shirt high quality gives you a practical checklist.
Step 9: Use model photography correctly
Model photography can be extremely useful when shopping online.
But don't judge the fit only by looking at the model.
Instead, find out:
- The model's height
- The model's measurements, if provided
- The size being worn
- The stated fit of the garment
Then compare those details with your own measurements and the garment size chart.
A T-shirt looking good on a 6'1" model wearing size M doesn't necessarily mean M will work for you.
Step 10: Check the return and exchange policy
Even with careful measurement, online clothing purchases aren't completely predictable.
Your perception of fit can also differ from what you expect.
Before ordering, understand the brand's return or exchange conditions.
Pay particular attention to:
- Return window
- Exchange eligibility
- Condition requirements
- Sale-item restrictions
- Who pays return shipping, if applicable
Knowing this before buying makes the decision considerably less stressful.
A simple online T-shirt comparison method
If you're comparing two T-shirts online, don't open ten browser tabs and try to remember everything.
Compare these seven things side by side:
| What to compare | What to ask |
|---|---|
| Fabric | What is it made from? |
| Weight | Is the weight suitable for how I'll wear it? |
| Fit | What silhouette am I actually buying? |
| Measurements | How does it compare with a T-shirt I already own? |
| Construction | What details indicate quality? |
| Design | Will I actually wear it regularly? |
| Price | Does the garment justify the price? |
What if you are between two sizes?
Don't automatically size up.
First compare the actual garment measurements with a T-shirt you already own.
If you're between sizes, think about the intended silhouette as well.
If the garment is designed as a regular fit, choosing a significantly larger size simply to create more room may change the proportions across the shoulders, sleeves and body length.
Fit should be considered as a whole.
How to choose a T-shirt colour online
Colour can appear slightly different depending on photography, lighting and your screen.
For your first purchase from an unfamiliar brand, neutral colours can make the decision easier.
Black, off white, navy and grey tend to integrate easily into existing wardrobes.
RARE STAG: making the online decision easier
At RARE STAG, the aim is to make the garment itself the focus.
Our T-shirts are built around regular-fit silhouettes, considered fabric, understated design and detailed construction.
The current collection includes Essentials, Signature and Burgundy Label pieces across a range of neutral colours and designs.
Off White Regular Fit Logo Jersey Crewneck T-Shirt
A clean neutral designed for versatile everyday wear.
Navy Regular Fit Logo Jersey Crewneck T-Shirt
A versatile darker neutral for everyday rotation.
Jet Black Regular Fit Logo Jersey Crewneck T-Shirt
A foundational black T-shirt for a minimal everyday wardrobe.
The 5-minute online T-shirt test
Before clicking Add to Cart, take five minutes.
- Find the size chart.
- Measure a T-shirt you already like.
- Compare the measurements.
- Read the fabric and construction information.
- Check the return or exchange policy.
Those five steps can eliminate most of the uncertainty involved in buying a T-shirt online.
The biggest mistake: buying by size label alone
The most important takeaway is simple.
Don't buy a T-shirt because you're usually an M.
Buy it because the garment measurements, fit and construction make sense for you.
Your existing wardrobe is one of the best references you already have.
Use it.
FAQs
How do I choose the right T-shirt size online?
Compare the brand's garment measurements with a T-shirt you already own and like. Pay particular attention to chest, shoulder, body length and sleeve measurements.
Can I buy a T-shirt online without trying it on?
Yes. Checking garment measurements, fit descriptions, fabric information, model measurements and return policies can significantly reduce the uncertainty.
Should I order my usual T-shirt size?
Not necessarily. Sizes aren't standardised between brands. Always compare the actual measurements and intended fit before ordering.
How do I know if an online T-shirt is good quality?
Look for information about fabric, weight, construction, neckline, stitching, finishing and garment measurements. More detailed product information generally makes quality easier to evaluate.
What should I do if I'm between two T-shirt sizes?
Compare both sizes with a T-shirt you already own. Consider the intended fit as well, because sizing up can change the proportions of the shoulders, sleeves and body.
Still deciding?
If you're comparing T-shirts before buying, continue with our complete T-shirt buyer's guide.
It brings together fabric, GSM, fit, construction, neckline, colour, sizing and price in one place.
Or explore the current RARE STAG T-shirt collection.
Continue the RARE STAG World
Explore our approach to style, craft and everyday dressing.
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