Not sure what those numbers on your shirt tag mean?
Wearing the wrong size can ruin how your suit looks—and feels.
Learn how to measure your neck, sleeves, and body properly so every shirt fits right and lays smooth under your jacket.
Read on to find your perfect shirt size and make your whole suit look sharper.
Here’s what you’ll learn:
- How to Measure for the Right Fit: Learn how to measure your neck, sleeves, chest, waist, and shirt length for a dress shirt that fits well under any suit.
- Understanding Shirt Size and Fit Types: Get clear on what neck and sleeve sizes mean, and how slim, regular, and classic fits differ.
- Choosing the Right Shirt for Your Suit: Know how shirt sizes compare to suit sizing and how to use size charts for a sharp, comfortable look.
What Is a Suit Shirt Size?
A suit shirt size refers to the measurements used to find a shirt that fits well under a suit. It usually includes two key numbers: neck size and sleeve length. For example, a shirt labeled 15.5/34 means a 15.5-inch neck and 34-inch sleeves. Some brands also include chest and waist measurements for a more tailored fit. Getting the right size helps your suit look sharp and feel comfortable all day.
Types of Suit Shirt Sizes
Alpha Sizes (S, M, L, XL)
These are general size categories often used for casual shirts. While easy to shop for, they aren’t detailed enough for formal dress shirts that require a more tailored fit.
Numeric Sizes (Neck × Sleeve)
Dress shirts often use precise measurements like 15.5″ × 32/33″. This system gives a better fit at the neck and sleeves—key for wearing the shirt under a suit or with a tie.
Trim, Regular, and Classic Fits
These terms describe the shirt’s shape. Trim fits are slimmer, regular fits are balanced, and classic fits are roomier. The right fit depends on your body type and comfort needs.
European vs. US Sizes
European sizes use centimeters for the collar, while US sizes use inches. If you’re shopping internationally, check a size chart to avoid ordering the wrong size.
Different Dress Shirt Fits
Classic Fit
This is the most traditional style, offering a roomy cut through the chest, arms, and waist. It’s comfortable and ideal for men who prefer a more relaxed feel or need extra room.
Regular Fit
A balanced option with moderate room in the chest and waist. It provides a clean silhouette without being too tight or too loose—great for everyday business wear.
Slim Fit
Tailored closer to the body with narrower sleeves and a tapered waist. Slim fit shirts are popular among men with lean builds or those who want a sharp, modern look.
How to Measure for a Men’s Dress Shirt
Neck Size
Wrap a tape measure around the base of your neck, just below your Adam’s apple. Keep it snug but not tight. Add half an inch for comfort—this is your neck size.
Sleeve Length
Measure from the middle of your back neck, across the shoulder, and down to the wrist. Keep your arm slightly bent. This gives you the full sleeve length.
Chest Size
Wrap the tape around the widest part of your chest, under your arms. Stay relaxed. This helps your shirt fit smoothly across the chest.
Waist Size
Measure around your natural waist, just above the belly button. Keep the tape level and not too tight. This controls how the shirt fits around your middle.
Shirt Length
Start at the top of your shoulder near the neck and measure down to your buttocks. This helps keep your shirt tucked when worn.
Suit Size Chart vs. Common Sizes
Suit Size Chart
A suit size chart shows detailed measurements like chest, waist, and jacket length. It helps you pick the right size based on your body, making the fit more accurate.
Common Sizes
Common sizes like S, M, or 38R are easier to find but less precise. They offer a general fit and may need tailoring to look perfect.
Final Thoughts
A good shirt fit brings the whole suit together. Start by measuring your neck, sleeves, chest, and waist—don’t just guess. Use a dress shirt size chart men rely on to get it right. Choose between slim, regular, or classic fits based on your build. If you’re unsure, check the tag or sizing guide. When the shirt fits well, everything else falls into place.