What Is The Difference Between 38R And 40R?

Have you ever wondered about the difference between 38R and 40R? It’s likely that you haven’t, as these numbers typically refer to clothing sizes.

However, knowing what they are in the first place will also prove helpful, no matter how much you want to see the difference between 38R and 40R.

Many people, particularly those new to fashion and garment fitting, are confused by the difference between 38R and 40R.

If you’re not in the know, it may seem like the two sizes are interchangeable, but they are very different.

To help clarify this confusion, here’s what you need to know about the difference between 38R and 40R.

The difference between a 38R suit jacket and a 40R suit jacket lies in their chest measurements. The chest measurement of a 38R suit jacket is 38 inches, while that of a 40R is 40 inches. Also, know that 38R manufacturers regard this size as a small jacket size, while the manufacturers of 40R regard it as a medium-sized jacket.

What Is 38R Size Meaning?

What Is the Difference Between 38R and 40R? 

If you are shopping for shirts, you may have come across a shirt size listed as 38R. The size 38R jacket is a size that refers to a jacket’s chest measurements. 

The first number (38) is how long it will fit around your chest at its fullest part (as measured under your arms and around your shoulder blades).

The number is a reference point for tailors and helps a shopper compare different brands. 

Most manufacturers regard a size 38R as a “small” jacket size. On the other hand, this can change according to the brand, as most brands have their sizing scheme.

The symbols indicate that a 38R jacket is a regular-cut jacket with a chest measurement of 38 inches; this is the case since the chest measurement of the coat is 38 inches.

According to the suit jacket size chart, a size 38R waist is 28-32 inches, its chest is 36-38 inches, its height is 5’8″-6, and its sleeve length is 34 inches.

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On the other hand, the 38R from one brand may fit you exactly, while the 38R from another brand may be either too tight or too loose.

As a result, there are two other varieties of the 38R jacket, the 38L and the 38S.

What Is 40R Size Meaning?

Even though the official sizing can vary depending on the manufacturer, most fashion designers regard a jacket with a 40R label as “medium size.”

This is because the chest measurement of a person wearing a 40R jacket can be up to 40 inches, and the letter R indicates that the cut is regular.

According to the size chart for the suit jacket, you can go for a size 40R if you fall within these specifications: waist measurement is between 30–34 inches, chest measurement is between 38–40 inches; height is between 5’8′′–6”, and sleeves that are 34 inches in length. 

Nevertheless, in addition to the 40R jacket, there are two more types of suit jackets: the 40S jacket and the 40L jacket.

38R Vs. 40R Suit

When choosing between a size 38R and a size 40R, the answer depends on how the jacket fits you.

If you are on the shorter side, I recommend going with a 38R rather than a 40R.

When comparing the two sizes, it is clear that both are chest measurements; however, one is slightly bigger than the other.

The suit jacket manufacturers consider the 38R a small jacket and the 40R a medium-sized one.

You measure the size of a suit jacket by two values: a number and a letter—for example, 38R.

The first number, 38, indicates how wide it is inches from top to bottom, while R stands for regular sizing.

This measurement comes from your chest behind your back and your other armpit.

The second number, 40, measures how long it is from your neck to your waist.

This measurement comes from your collar to around two inches below your armhole. 

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If you have a sleeve length of 34 inches and are between 5’8 and 6 feet tall, you can wear either the 38R or the 40R; I recommend the 38R if your waist is between 28-32 inches and your chest is between 36-38 inches.

If your waist measurement is between 30–34 inches and your chest measurement is between 38–40 inches, then 40R is a good fit

The Main Difference Between 38R and 40R

38R and 40R are both regular sizes for suits and chest measurements in suit jackets. Although similar, they are different.

There are various reasons one is a better fit for you than the other, but the main difference is the chest measurement.

The chest measurement of the 40R is 2 inches larger than the 38R, making the 38R snug for those with a more petite frame.

Due to this 2-inch difference in the chest measurement, for you to buy jackets or blazers tailored for you, your shoulders need to be measured accurately before ordering your garments.

So if you have narrow shoulders, choose a size 38R, but if you have broader shoulders, choose a size 40R instead.

For a person with an athletic build, it can help to have extra room in your suit jacket to move around comfortably.

As for whether or not you should get a 40R or a 38R, that depends on your body type.

For example, if you are of average height and quite slim, opt for a 38R. On the other hand, if you have more of an average and tall build, go with a 40R.

Both fit well and are simply a matter of personal preference. However, if you’re in between sizes and want something that looks great on you, opt for a size up (from your regular suit jacket size).

That will give you enough room to move around comfortably without looking too big.

Which Is Better For Your Height, 38R Or 40R?

If you’re trying to figure out what size suit to buy, it’s always a good idea to consider your height.

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The standard jacket length is typically between 38 and 40 inches, so if you fall in that range, you’ll be fine.

If you’re concerned about which jacket size is better for your height, keep in mind that there isn’t one specific answer.

A perfect jacket-size fit will vary depending on your build, torso length, and shoulder width, but here are some general guidelines to help you make an informed decision. 

If you have broad shoulders and a shorter torso, go with a 40R. If you have a stocky or muscular build and long arms, try a 38R.

If you have broad shoulders and a muscular build, you might want to choose a size that fits in between – like a size 40R.

It will keep your body from getting lost in all of that fabric! But if you’re athletic or built more like an Adonis than a Hercules, then sizing down is better.

A size 38R will accentuate your height while leaving enough room for comfort.

If you are 5’7 or taller, a 38R should provide enough space in length while still keeping things slimmer overall.

On the other hand, if you are shorter than 5’7, a 40R would fit more comfortably with a few extra inches in length.

The correct suit size for your body is entirely dependent on your height.

As a rule of thumb, you want to end up with at least an inch of extra space in each dimension around your torso so that you have room to move comfortably.

To fit into these dimensions, taller men require more length than shorter men.


38R and 40R are regular-cut suit jacket sizes for men. Although similar in that a person with the same height and sleeve length can wear both these suit sizes, the critical difference is in their chest measurement.

Therefore, if you have a broader chest, you should opt for 40R.

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