Whether you are ordering a custom suit from overseas or comparing your body measurements against a size chart, one thing trips people up more than anything: converting centimeters to inches. Most of the world measures in metric, but the tailoring tradition — and much of the English-speaking fashion industry — still relies on imperial measurements. Getting the conversion wrong by even half an inch can mean the difference between a jacket that drapes perfectly and one that pulls across the chest. This guide gives you an instant converter tool, the formula you need, a complete body measurement reference table, and practical advice on measuring yourself for custom clothing.

Why Accurate Measurements Matter for Custom Clothing

A centimeter here or there might seem trivial, but in tailoring those small numbers add up to dramatic differences in fit. A suit jacket that is just 1 inch too wide in the shoulders cannot be altered — the entire structure of the garment is wrong. A pair of custom trousers where the inseam is off by an inch will break at the wrong point on your shoe, ruining the silhouette.

When you convert between centimeters and inches, rounding introduces risk. Consider this: 40 cm converts to 15.748 inches. If you round to 16 inches, you have added over 6 millimeters — enough to make a shirt collar noticeably loose. The best practice is to round to the nearest quarter inch (0.25"). So 15.748" becomes 15.75", not 16".

This is precisely why tools like Hockerty's Digital Body Profile exist. Instead of measuring yourself, converting units, and hoping you rounded correctly, the system captures your exact dimensions from a photograph.

How to Measure Yourself for a Custom Suit

If you prefer to take your own measurements with a tape measure, follow these guidelines. Use a soft fabric tape measure (not a metal one), wear thin clothing or measure over undergarments, and stand naturally — do not puff out your chest or suck in your stomach. Having someone else take the measurements for you significantly improves accuracy.

Chest — Wrap the tape around the fullest part of your chest, under your arms and across your shoulder blades. Keep the tape level all the way around. Breathe normally and do not inflate your chest. The tape should be snug but not compressing your torso.

Waist — Measure at your natural waistline, which is the narrowest part of your torso, typically about one inch above your navel. This is not where your jeans sit — it is higher. Relax your stomach and breathe out naturally before reading the tape.

Hips — Stand with your feet together and measure around the widest point of your hips and buttocks. Keep the tape level. This measurement matters for trouser fit and jacket length.

Shoulders — This one requires a helper. Measure from the edge of one shoulder (where the shoulder seam of a well-fitting jacket would sit) straight across the back to the other shoulder edge. The tape should follow the natural curve of your upper back.

Sleeve Length — Bend your elbow slightly at about a 90-degree angle. Measure from the shoulder point (the bony tip where your arm meets your shoulder) down to where you want the sleeve to end — typically at the base of the thumb where your wrist meets your hand. For dress shirts, the sleeve should reach the top of the hand to allow proper cuff show beneath a jacket.

Inseam — Measure from the crotch seam straight down the inside of the leg to the desired trouser length. The easiest method: take a pair of well-fitting trousers, lay them flat, and measure the inside leg seam from crotch to hem.