Lacoste Size Guide UK: What Size Is a Lacoste 4, 5 or 6?

The simple answer is that Lacoste size 4 is Medium, size 5 is Large and size 6 is Extra Large for men's polo shirts. However, understanding your chest measurement and the garment's cut is equally important.

This Lacoste size guide UK explains the brand's numerical sizing, official chest measurements, Classic Fit differences, shirt collar sizes and US-to-UK conversions to help you shop confidently.

Lacoste Size Chart: What Are Sizes 4, 5 and 6 in the UK?

Lacoste uses numerical sizes for men's polo shirts, alongside standard letter sizes. Its official measurement chart helps shoppers identify the right size based on chest circumference.

Lacoste Men's Polo Shirt Size Chart

Source: Lacoste's official size charts. The UK chart provides the corresponding inch ranges and single centimetre reference figures; the centimetre ranges above are also published in Lacoste's international charts.

These measurements refer to your body, not the exact dimensions of the garment.

What Is Lacoste Size 4?

Lacoste size 4 is equivalent to Medium (M) and generally corresponds to a chest circumference of 97–101 cm.

If you normally wear a Medium, size 4 is a sensible starting point. However, check whether the garment has a Classic, Regular or Slim Fit.

What Is Lacoste Size 5?

Lacoste size 5 means Large (L), with a recommended chest measurement of approximately 105–109 cm.

A size 5 Classic Fit polo will generally offer more room than a Slim Fit in the same numerical size.

What Is Lacoste Size 6?

Lacoste size 6 corresponds to Extra Large (XL), designed for chest measurements of approximately 113–117 cm.

If you fall between sizes, consider the garment's cut and your preferred fit before sizing up.

These conversions are useful when browsing Lacoste men's clothing, but always check individual product details.

How to Measure Your Chest for Lacoste Clothing

Accurate measurements make choosing Lacoste clothing much easier, particularly when buying online.

Follow these steps:

1. Stand naturally: Keep your arms relaxed by your sides.
2. Measure your chest: Wrap a flexible measuring tape around the fullest part of your chest.
3. Keep the tape level: Ensure it sits comfortably without pulling tightly.
4. Record your measurement: Note the result in centimetres or inches.
5. Check Lacoste's size chart: Match your measurement with the recommended size.

For example, if your chest measures 100 cm, Lacoste size 4 (Medium) is a suitable starting point.

Remember that body measurements and garment measurements are different. A polo shirt needs additional fabric around your chest to allow comfortable movement.

If you already own a well-fitting polo, measuring its chest width can also help you compare garment dimensions.

Lacoste Classic Fit vs Regular Fit vs Slim Fit

Lacoste sizing isn't just about numbers. The brand offers different cuts, and each creates a distinct silhouette.

According to Lacoste's official men's polo fit guide:

These are garment chest widths, not body chest circumferences.

Classic Fit: Traditional and Comfortable

Lacoste Classic Fit polo shirts have a comfortable straight cut, slightly relaxed sleeves and gently sloping shoulders.

They're suitable for shoppers who prefer more room around the chest and waist without an oversized appearance.

Regular Fit: Balanced Everyday Style

Regular Fit offers a slightly closer shape than Classic Fit.

It follows the shoulders more naturally and works particularly well with jeans, chinos and smart-casual outfits.

Slim Fit: A Closer Silhouette

Slim Fit polos sit closer to the chest, shoulders and sleeves.

They're designed for a streamlined appearance, but shouldn't restrict movement or pull uncomfortably across the body.

Loose Fit: Relaxed and Roomy

Loose Fit offers extra volume, extended sleeves and a more relaxed silhouette.

It's worth considering if you prefer casual, oversized styling rather than simply purchasing a larger Slim Fit shirt.

When shopping for Lacoste men's polo shirts, check the fit description alongside the numerical size.

Lacoste Shirt Size Guide: Understanding Collar Sizes

Some Lacoste shirts, including certain Oxford-style designs, use sizes such as 38, 39, 40 and 42.

These are different from the numerical sizing used for men's polo shirts.

Lacoste Men's Shirt Measurement Chart

To measure your collar size, wrap a flexible tape around the base of your neck, where the shirt collar normally sits.

Keep the tape comfortable and compare your measurement with Lacoste's official chart.

Important: Lacoste polo size 4 and shirt size 40 belong to different sizing systems, although both can correspond to Medium.

When exploring Lacoste men's shirts, check the collar size, chest measurements and intended fit.

Lacoste US Size to UK: Is There a Difference?

For men's polo shirts, Lacoste's official UK and US measurement guides use the same basic numerical-to-letter conversions.

• Lacoste size 4 = Medium in the UK and US.
• Lacoste size 5 = Large in the UK and US.
• Lacoste size 6 = Extra Large in the UK and US.

Therefore, a men's Lacoste size 5 polo purchased from a US retailer doesn't normally require conversion to a different UK letter size.

However, this doesn't apply to every product category.

Lacoste footwear has separate UK, US and European conversions. Women's and children's clothing also use different sizing charts.

Always confirm which garment category the measurements refer to.

Do Lacoste T-Shirts, Hoodies and Jumpers Fit Differently?

Yes. Although Lacoste's numerical sizing provides a useful reference, different garments may have different cuts and proportions.

Lacoste T-Shirts

T-shirts can have slim, regular or relaxed fits.

A fitted cotton T-shirt may sit closer to the body than a loose-cut design, even in the same letter size.

Check the material and fit description when browsing Lacoste men's T-shirts and vests.

Lacoste Hoodies

Hoodies generally need enough room for movement and layering.

Consider whether you'll wear a T-shirt underneath, and check the garment's length and shoulder fit.

Explore Lacoste men's hoodies to compare available styles.

Lacoste Jumpers

Jumpers vary according to fabric, thickness and construction.

A lightweight knitted jumper may fit differently from a heavier sweatshirt-style garment.

Review the individual measurements when browsing Lacoste men's jumpers.

What About Lacoste Shorts, Tracksuits and Swimwear?

For lower-body clothing, waist measurements are more useful than chest size.

Lacoste shorts: Check the waist, leg opening and intended length. Explore men's Lacoste shorts.

Lacoste tracksuits: Check both the top and bottoms. A correctly sized jacket doesn't necessarily mean matching trousers will fit your waist. Browse Lacoste men's tracksuits.

Lacoste swimwear: Consider waist measurements, waistband construction and adjustable drawcords where applicable. Explore Lacoste men's swimwear.

Also confirm whether a tracksuit listing includes a complete set or separate garments.

Common Lacoste Sizing Mistakes to Avoid

Even with a Lacoste measurement chart, a few mistakes can lead to an uncomfortable fit.

• Relying only on your usual size: Different brands and styles can have different proportions.
• Ignoring the fit: Classic, Regular, Slim and Loose Fit polos don't have identical dimensions.
• Confusing numerical labels: Polo size 4 is different from collared-shirt size 40.
• Automatically sizing up: A larger size may affect sleeve length and shoulder placement.
• Overlooking fabric composition: Materials and construction can influence stretch and comfort.

If you're between sizes, compare the specific garment measurements and intended fit before choosing.

Where to Buy Lacoste Clothing in the UK

Once you've identified your size, finding the right style becomes easier.

At Top Brand Outlet, UK shoppers can explore authentic branded Lacoste clothing at outlet prices.

The selection may include previous-season and discounted styles, with available sizes and colours depending on current stock.

If you're looking for reduced clothing, explore the Lacoste sale or browse men's Lacoste sale items.

For a more specific selection, check discounted Lacoste men's polo shirts.

Before ordering, confirm the numerical size, fit, fabric composition and any measurements provided in the product description.

Frequently Asked Questions About Lacoste Sizing

Is Lacoste Size 4 a Medium?

Yes. Lacoste men's polo size 4 corresponds to Medium, with a chest measurement of approximately 97–101 cm or 38–40 inches.

Is Lacoste Size 5 a Large?

Yes. Lacoste size 5 is Large, corresponding to a chest measurement of approximately 105–109 cm.

Is Lacoste Size 6 an XL?

Yes. Lacoste size 6 is Extra Large, generally corresponding to a chest measurement of 113–117 cm.

Does Lacoste Run Small?

Not necessarily. Lacoste offers different fits, so a Slim Fit polo will feel closer than a Classic Fit in the same size. Always compare measurements.

Should I Size Up in a Lacoste Polo?

Not automatically. Check your chest measurement and preferred silhouette first. A Classic or Loose Fit may provide additional room without requiring a larger numerical size.

Final Thoughts: Finding Your Ideal Lacoste Size

Understanding Lacoste sizing becomes easier once you know what the numerical labels mean.

For men's polo shirts, remember that size 4 is Medium, size 5 is Large and size 6 is Extra Large.

Measure your chest, check the official Lacoste size chart and choose a garment fit that matches your preferences.

For shirts, shorts and other clothing, use the appropriate measurement guide rather than relying on polo sizing alone.

With those details in mind, you can explore the Lacoste collection at Top Brand Outlet and shop with greater confidence.