How to measure for a cassock comes down to six numbers: height, chest circumference, waist circumference, shoulder width, arm length from shoulder to wrist, and neck or collar circumference. I have fitted cassocks for clergy across the world, and in my experience a ready-made cassock size that looks right on a chart still fails at the shoulders, which is why this guide gives you the method rather than a table of generic sizes. The same measurements apply whether you are fitting a priest, a deacon or choosing altar server cassocks for your parish, and the collar number should agree with the collarettes and collars you already wear every day.
How do you measure for a cassock?
Measure six points: height, chest, waist, shoulders, arm length and neck, each taken over a normal shirt with a soft tape measure. The cassock (soutane) is the long, close-fitting garment worn daily, so one skipped number shows up in the mirror every morning. Take the whole set in a single sitting, standing the same way throughout, and write each number down as you go.
Height, chest and waist
Measure height without shoes, standing straight against a wall, because it decides the overall length of the garment. Take the chest at its fullest point with the tape level under the arms, and the waist at the natural waist, both snug but never compressed — a chest measured on a deep breath produces a garment that pulls across the buttons.
Shoulders, arms and neck
Measure the shoulders straight across the back, from outer edge to outer edge; the arms from the shoulder point to the wrist bone; and the neck where a collar actually sits. These three decide the silhouette of a cassock more than the chest does, which is why I ask customers to take the shoulder measurement twice.
What does a sensible cassock size chart look like?
A sensible cassock size chart is a method table rather than a column of ready-made numbers, because no generic chart can capture your shoulder slope or your proportions. This is the reference I use for every made-to-measure order, together with the mistakes I most often have to correct:
| Measurement | How to take it | Common mistake |
|---|---|---|
| Height | Standing straight, without shoes, heels against a wall | Measuring in shoes, which adds length the hem should not have |
| Chest circumference | Tape level under the arms, fullest point, breathing normally | Pulling the tape tight or measuring over a thick sweater |
| Waist circumference | Tape around the natural waist, snug but not compressed | Holding the stomach in — the cassock is worn every day |
| Shoulder width | Straight across the back, outer edge to outer edge, standing square | Measuring with rounded shoulders |
| Arm length | Shoulder point to wrist bone | Stopping at the elbow or measuring a bent arm |
| Neck/collar circumference | Around the base of the neck, where the collar sits | Copying a number from an old shirt label |
Why are the shoulders the critical fit point?
The shoulders are the critical fit point because a wrong shoulder cannot be corrected by a tailor cheaply — sleeves and hems can be adjusted, but re-cutting a shoulder means opening the entire garment. Measure this number twice and note both readings when you order. When the cassock arrives, check the sleeves: they must reach the wrist with the arm slightly bent, so bend your arm a little and see whether the cuff stays put or slides up the forearm.
How long should a cassock be?
A cassock should reach the top of the shoes, covering properly without dragging on the floor. Your height measurement lets the atelier set this length, and I recommend checking the finished hem while wearing the shoes you normally wear for Mass. If the hem catches on steps it is too long; if the shoe tops show it is too short.
How do you measure the neck and collar for a cassock?
Measure around the base of the neck where the collar sits, snug enough that one finger slides underneath. This number matters more than people expect, because the cassock closes high and the collar carries the weight of the daily collarette or band. Use the same tape position and the same snugness you would for our clergy shirts, so the two garments agree at the collar.
Do altar servers need the same measurements?
Yes — altar server cassocks are measured with the same six numbers, taken exactly the same way. Children grow quickly, so I advise re-measuring at the start of each school year instead of estimating from last year's figures. Our made-to-measure altar server cassocks are cut to these measurements just as clergy garments are, in the red and black that servers traditionally wear.
Why does a Roman cassock have 33 buttons?
A traditional Roman cassock often has 33 buttons, recalling the years of Christ's earthly life. The number is devotional rather than practical: the buttons run down the front and change nothing about how you measure. Tell us at the ordering stage if you prefer a different front style; the measurement method stays identical.
Which colour cassock should I order?
Clergy cassocks are black, a bishop's choir cassock is purple-toned (amaranth), and altar-server cassocks exist in red and black. Colour follows role and occasion rather than taste, so confirm diocesan custom if you serve in a community where both are worn. The related article on cassock colours linked at the end of this post explains the symbolism in full.
FAQ
Can a tailor alter a cassock that does not fit? Sleeves, waist and hem can usually be adjusted, but the shoulders are the exception — a wrong shoulder cannot be corrected cheaply, which is why I treat the shoulder measurement as the critical one.
Should measurements be taken over clothing? Over a normal shirt, yes; over a sweater or jacket, no. Thick layers add bulk to the chest and waist and leave the finished cassock hanging loose.
What if my measurements seem inconsistent? Re-take the doubtful number at a different time of day, standing the same way, and send both readings with a note on which you trust more; from experience I can usually judge which is right.
Is made-to-measure worth it for a cassock? For a garment worn daily, I believe so — custom sizes remove the compromise of chart sizes, and the six measurements above are all an atelier needs to cut one correctly.
Conclusion
Take the six measurements carefully, order to measure, and cassock size problems disappear: the garment will close comfortably at the collar, move freely at the shoulders and end exactly at the top of the shoes. Send me your numbers and I will cut and finish the cassock by hand in our Polish atelier, with worldwide shipping to any address. While you are completing your daily wardrobe, see our clergy shirts and clergy surplices, cut on the same made-to-measure principle.
Related reading
Continue with my guide to measuring for a chasuble and alb, then read who may wear a cassock and what the different colour cassocks mean. The guide to bishop's vestments shows where the amaranth choir cassock fits into the full set.
