A Complete Guide to the Perfect Fit

There's nothing quite like the confidence that comes with a well-fitted suit. Whether you’re suiting up for a wedding, an important business meeting or simply want to upgrade your tailoring collection, fit is everything. While a skilled tailor can certainly take care of your measurements, it’s easier than you think to do it for yourself, and it just takes a few minutes of your time.

In this guide, we’ll walk you through everything you need to know about measuring yourself for a suit at home, step by step. Armed with a few tools and with a little care, you can get the measurements you need to ensure the suit you choose fits you like a glove. 

Why Fit Matters

Before diving into how to measure correctly, let's first understand why it's important that your suit fits perfectly. A well-fitted suit enhances your natural shape, projects professionalism, and feels more comfortable than an untailored suit. Measuring yourself before buying a suit, especially online, eliminates the guesswork of sizing and helps avoid the time-consuming process of returning to the post office. 

What You’ll Need to Measure for a Suit

Make sure you have the following tools ready:

• A soft tape measure (in inches) – Flexible and accurate.
  

• A notebook or phone – To record each measurement.
  

• A mirror – Useful if you're working alone.
  
  

Pro Tips Before You Start Measuring

• Measure twice. Always double-check your measurements to avoid inaccuracies.
  

• Stand naturally. Don’t puff your chest out or suck in your stomach—stay relaxed for the most accurate fit.
  

• Wear fitted clothing or measure shirtless. Loose clothes can distort the measurements.
  

• Measure before eating or after a workout. Your body can fluctuate slightly, so aim for a neutral time of day.
  

• Plan ahead. If you're preparing for a big event, take measurements at least 4–6 weeks in advance to leave time for suit selection and any necessary tailoring.
  
  

How Long Does It Take to Measure for a Suit?

One of the most common questions we get asked, and the good news is that it only takes about 5-10 minutes. If you’re measuring solo, give yourself a little extra time. It’s a small investment of time for a big return in confidence and comfort. 

How to Measure for a Suit: Step-by-Step

A) Chest Measurement

Arguably the most important measurement you’ll take, the chest measurement affects both your blazer and waistcoat fit. 

How to Measure:

1. Stand upright with your arms relaxed at your sides.
   

2. Wrap the tape measure around the fullest part of your chest (usually just under the armpits).
   

3. Start at the centre of your back, come around the front, and return to the starting point.
   

4. Don’t hold your breath—stay relaxed.
   

5. Record the number in inches.
   
   

Pro Tip: If you're between sizes, size up. A blazer that's too tight across the chest will be uncomfortable and restrict movement. Plus you can always have a larger sizer tailored to fit you perfectly. 

---

B) Waist Measurement

Suit trousers hang differently from casual trousers like jeans. Suit trousers should sit just above the hip bone. 

How to Measure:

1. Find the point just below your navel, about 1 inch above the top of your hip bone.
   

2. Wrap the tape around this part of your torso.
   

3. Make sure the tape is snug but not tight.
   

4. Breathe normally—don’t suck in!
   

5. Record the number in inches.
   
   

Fit Note: If you prefer high-waisted trousers, measure slightly higher; if you like a modern, lower rise, you can adjust accordingly.

---

C) Sleeve Length

Sleeve and trouser hems are some of the most common alterations tailors will adjust. However it’s helpful to get this measurement right from the beginning. 

How to Measure:

1. Let your arm hang naturally at your side.
   

2. Measure from the shoulder seam (where the sleeve meets the shoulder) down to your wrist.
   

3. Aim for the sleeve to stop just above your wrist bone, allowing about half an inch of your shirt cuff to show.
   
   

Fit Tip: If you're unsure where your shoulder seam is, wear a shirt that fits well and use it as a guide.

---

D) Inside Leg (Inseam) Measurement

Trouser length is also one of the most important measurements to take. Trousers too short or too long can ruin the whole look. 

How to Measure:

1. Stand straight (or have a friend help).
   

2. Measure from the crotch down the inside of your leg to the desired hemline.
   

3. Most suits come in short (29"), regular (31"), and long (33").
   
   

Pro Tip: If you're in between sizes, choose the longer option. It's always easier to take trousers up than to add fabric.

What’s Next?

Once you've got your measurements, it’s time to match them with the sizing chart of the brand you’re purchasing from. If you’re shopping with Marc Darcy, you can consult our complete Suit Size Guide to find the best-fitting option for you. We also have a handy size predictor where you can input your age, height and weight to predict your size. 

Final Thoughts

Measuring yourself for a suit might sound intimidating, but once you do it, you’ll realise just how simple—and empowering—it is. With accurate measurements in hand, you’ll not only shop smarter but ensure every suit you wear looks like it was tailored specifically for you.

So grab that tape measure, take five minutes, and prepare to look your best—because the right fit makes all the difference.

Discover more with Marc Darcy 

As men’s suits experts, we pride ourselves on being able to help men find their perfect suit for any occasion. See more of our men’s blog for helpful tips and inspiration for clothing, accessories, and more.

If you require a little extra help just email our team on sales@marcdarcy.co.uk who will be happy to assist you in finding the perfect size.

Looking for more? See our Wedding Suits For Men.