Introduction
Buying a suit should be simple. You try it on, it fits, you buy it. But the numbers on the label tell a story. 170/88A. 48R. S, M, L. These codes contain information about height, chest size, and body shape. Understanding them is the difference between a suit that fits perfectly and one that pulls at the shoulders or bunches at the waist. This guide explains suit sizing: the national standard “size system,” how to read body type codes, what casual suit letters (S, M, L) actually mean, and how trouser sizing works across different measurement systems. By the end, you will know exactly what the numbers mean and how to choose a suit that fits.
What Is the National Standard “Size System”?
In many countries, including China, suit sizes follow a standardized system that uses three components: number, type, and body shape.
The Components
| Component | What It Represents | How It Is Measured |
|---|---|---|
| Number | Height | Expressed in cm; 5 cm increments |
| Type | Net chest circumference (top) or net waist circumference (bottoms) | Chest: 4 cm increments; Waist: varies |
| Body shape | Difference between chest and waist | Classified as Y, A, B, C |
A typical size label reads: 170/88A
- 170 = Height (number)
- 88 = Chest circumference (type)
- A = Body shape (normal)
Body Shape Classifications
Body shape is determined by the difference between net chest circumference and net waist circumference.
| Code | Description | Male Difference (cm) |
|---|---|---|
| Y | Broad shoulders, thin waist (athletic) | 22–17 |
| A | Normal body type | 16–12 |
| B | Slightly protruding abdomen (fuller) | 11–7 |
| C | Obese | 6–2 |
Example: A man with a chest measurement of 92 cm and a waist measurement of 80 cm has a difference of 12 cm. That falls within the A body shape range—normal.
How Do You Read Suit Size Labels?
Once you understand the components, reading a label becomes straightforward.
Step 1: Identify the Number (Height)
The first number is height. It is the height of the person the suit is designed to fit, not the length of the garment.
- 165: Designed for someone around 165 cm tall
- 170: For someone around 170 cm tall
- 175: For someone around 175 cm tall
Range: Heights typically increase in 5 cm increments.
Step 2: Identify the Type (Chest or Waist)
The number after the slash is the net chest circumference (for jackets) or net waist circumference (for trousers).
- Jackets: 88, 92, 96, 100 cm (4 cm increments)
- Trousers: Waist measurement in cm
Step 3: Identify the Body Shape Code
The letter at the end tells you the intended body shape.
| Code | Best For |
|---|---|
| Y | Athletic build; broad shoulders; narrow waist |
| A | Average build |
| B | Fuller midsection |
| C | Larger waist; stocky build |
Real-world case: A customer with a 176 cm height, 98 cm chest, and 86 cm waist would look for a size around 175/98A. The chest measurement (98) falls within the 96–100 range, and the chest-waist difference (12 cm) places him in A body shape.
How Do Casual Suit Sizes (S, M, L, XL) Work?
Many casual suits use letter sizing rather than the numbered system. This is simpler but less precise.
General Guidelines for Men
| Size | Approximate Height | Notes |
|---|---|---|
| S | 165–170 cm | Small; often shorter sleeves and jacket length |
| M | 170–175 cm | Medium; most common size |
| L | 175–180 cm | Large; longer sleeves and body |
| XL | 180–185 cm | Extra large |
| XXL | 185–190 cm | Double extra large |
Important: Letter sizes vary significantly between brands. One brand’s M may be another’s L. Always check the brand’s specific size chart.
Adjusting for Build
Letter sizes assume an average build. If you are:
- Athletic or broad-shouldered: Size up one letter
- Fuller midsection: Size up one letter
- Slim: Stick with the letter for your height or size down if the fit is loose
Real-world case: A man 175 cm tall with an athletic build (broad shoulders, narrow waist) typically wears a M in height but may need a L jacket to accommodate shoulder width, then have the waist taken in.
How Do Trouser Sizes Work?
Trousers are sized differently than jackets. Three measurement systems are common.
Three Measurement Systems
| System | Example | How It Works |
|---|---|---|
| Inches (US) | 32, 34, 36 | Waist circumference in inches |
| Centimeters (metric) | 81, 86, 91 | Waist circumference in cm |
| European (chest/waist) | 48/50 | 1/2 chest and 1/2 waist in cm |
Inches to Centimeters Conversion
| Inches | Centimeters | Typical Fit |
|---|---|---|
| 28 | 71 | Slim |
| 30 | 76 | Slim to average |
| 32 | 81 | Average |
| 34 | 86 | Fuller |
| 36 | 91 | Larger waist |
| 38 | 96 | Plus size |
Note: European sizing often uses a code like “48/50” where the first number is half the chest circumference and the second is half the waist circumference. This system is common in tailored suits from European manufacturers.
How Do You Measure Yourself for a Suit?
If you are buying online or having a suit made, accurate measurements are essential.
What to Measure
| Measurement | How to Measure |
|---|---|
| Height | Without shoes; stand straight against wall |
| Chest | Around fullest part; arms relaxed at sides |
| Waist | Around natural waistline (belly button level) |
| Hips (for trousers) | Around fullest part of seat |
| Shoulder width | Across back; from edge of one shoulder to other |
| Sleeve length | From shoulder seam to wrist bone |
| Jacket length | From base of collar to desired hem (typically covers seat) |
Tools
- Soft measuring tape (cloth or plastic, not metal)
- Helper for back measurements
- Wear lightweight clothing; not bulky sweaters
How Do You Choose Between Different Size Systems?
Different retailers use different systems. Knowing how to convert helps you order correctly.
| Retailer Type | Typical Size System | What to Do |
|---|---|---|
| Formal suit shops | Numbered (170/88A) | Match your measurements to the size |
| Casual menswear | Letter (S, M, L) | Check brand size chart; consider build |
| European brands | 48, 50, 52 (chest half-measure) | Half chest in cm; e.g., 48 = 96 cm chest |
| US online | Jacket: 38, 40, 42 (chest); Pants: 32, 34 (waist) | Jacket size = chest measurement in inches |
Size Conversion Table (Approximate)
| US Jacket | European | Chest (cm) | Height (cm) | Letter |
|---|---|---|---|---|
| 36 | 46 | 91 | 165–170 | S |
| 38 | 48 | 96 | 170–175 | M |
| 40 | 50 | 101 | 175–180 | L |
| 42 | 52 | 106 | 180–185 | XL |
| 44 | 54 | 111 | 185–190 | XXL |
Sizing tip: For a modern, tailored fit, choose the size that matches your chest measurement. For a more relaxed fit, size up one. For a slim fit, size down one (if your shoulders allow).
Conclusion
Suit sizing is a system of numbers and letters that tell you height, chest size, and body shape. The national standard uses number/type/body shape—for example, 170/88A means height 170 cm, chest 88 cm, normal build. Body shape codes (Y, A, B, C) indicate the difference between chest and waist, helping you choose the right cut. Casual suits use letter sizes (S, M, L, XL) that approximate height but require adjustment for build. Trousers come in inches, centimeters, or European half-measures. To choose correctly, take your measurements, understand the system the retailer uses, and consider your build. With the right fit, a suit looks sharp, feels comfortable, and flatters your body.
FAQs
What does 170/88A mean on a suit label?
170 is the height (in cm) the suit is designed for. 88 is the net chest circumference (in cm). A is the body shape code, indicating a normal build (chest-waist difference of 16–12 cm). This size fits someone around 170 cm tall with a 88 cm chest and average proportions.
What is the difference between Y, A, B, and C body shapes?
Body shape codes indicate the difference between chest and waist measurements. Y: athletic (broad shoulders, narrow waist; difference 22–17 cm). A: normal (difference 16–12 cm). B: fuller midsection (difference 11–7 cm). C: larger waist (difference 6–2 cm). Choose the code that matches your body type for the best fit.
How do I convert between US and European suit sizes?
US jacket sizes (38, 40, 42) correspond to chest measurements in inches. European sizes (48, 50, 52) are half the chest measurement in cm. A US 40 (chest 40 inches ≈ 101 cm) corresponds to European 50 (half of 100 cm). Use conversion charts and check brand-specific sizing.
Are S, M, L suit sizes reliable?
Letter sizes are approximate. They vary between brands. A size M from one brand may fit a 170–175 cm person; another may fit 175–180 cm. Always check the brand’s specific size chart with measurements. If you have an athletic or fuller build, adjust up or down accordingly.
How do I measure my chest for a suit?
Stand with arms relaxed at your sides. Wrap a soft measuring tape around the fullest part of your chest, typically across the nipples and under the armpits. Keep the tape level and snug but not tight. Exhale normally. Record the measurement in cm or inches. This is your chest size for jacket selection.
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At Yigu Sourcing, we help businesses source suits and tailored clothing from reliable Chinese manufacturers. We work with suppliers who provide detailed size charts, consistent grading across sizes, and quality construction. Our team evaluates fabric quality, stitching, and size accuracy. Whether you need formal suits with numbered sizing, casual suits in letter sizes, or custom sizing for specific markets, we connect you with manufacturers who deliver consistency and fit. Let us help you source suits that fit well and sell well.