The question of what bra size is a man comes down to two measurements in inches, and the two figures are read separately. The underbust sets the band, the number. The full chest sets the cup, the letter. The cup comes from the difference between them. A male chest usually measures a small difference, so this range carries one cup, A, on bands from 34 to 42.
Bra sizing was drafted around a different set of proportions, so the charts in most shops begin from an assumption that a male chest does not meet. The letters were built to describe a chest that projects forward. A flatter chest has no row to sit in.
This article sets out how the system is built. It covers why no men's size chart exists, how two numbers produce a size, what the difference between them means, and where a bra sized US 34A-42A lands. The step-by-step method belongs with the sizing questions, and stays there.
Key takeaways
- A bra size carries two figures. The underbust sets the band, and the difference to the full chest sets the cup.
- No standard men's size exists, because a male chest has no standard bust measurement. The band sets the size.
- Cup size comes from a difference. In this range the cup is A, at about 1 to 2 inches between the full chest and the underbust.
- Lace for Gentlemen makes bras for men in US 34A to 42A, with custom sizing that adjusts a size inside that range and also covers measurements outside it.
- Height, weight and shirt size do not decide bra size. Two measurements do.
Why there is no "men's size chart"
No men's size chart exists, because bra sizing is drafted for a chest that projects forward from the ribcage by a measurable amount. On a male chest the difference between the underbust and the full chest is usually small, so the standard chart has almost nothing to grade against.
A label like 36A carries two measurements behind one number. The 36 is the ribcage, the circumference under the chest where the band sits. The A is the difference between that ribcage and the fullest point of the chest. Every bra chart, women's or otherwise, runs on those same two figures.
The charts were drawn for a chest large enough to fill a molded cup, on a figure whose bust projects forward from the ribcage. When a flatter chest sits inside a cup cut for more projection, the fabric collapses into a horizontal fold across the front. A label can be correct while the garment is still wrong. The letters were never built to describe this chest, so a straight men's size chart does not exist.
A second drift comes from the older charts. Some add four or five inches to the underbust before reading the band, a rule of thumb built for a deeper ribcage. This range takes the band directly from the underbust, which keeps the number honest on a broader ribcage. Add four inches to a male underbust, and the whole size lands two bands too large. No cup corrects a band that started wrong.
The finished sizes are listed under bras sized 34A-42A.
How bra size for a man works: two numbers
Two measurements in inches set a bra size for a man, the underbust and the full chest. Both are taken over a bare chest or a thin, unpadded layer, with the tape level. A soft tape and half a minute are enough.
- Underbust: the circumference of the ribcage, measured directly under the chest where a band sits. This figure becomes the band.
- Full chest: the circumference around the widest part of the chest. This figure is used only to work out the cup.
One rule catches most people out. A 40-inch chest measurement does not automatically mean a 40 band. The band comes from the underbust. The full chest figure sets the cup.
Take two examples. An underbust of 35 inches with a full chest of 37 inches gives a 36A. An underbust of 41 inches with a full chest of 43 inches gives a 42A. In each case, the underbust sets the band, and the full chest only sets the cup.
Band sizes run in even numbers. When the underbust reads odd, say 37, round up to the nearest even figure. That gives 38, the starting band.
The full measuring steps belong with the sizing questions, where how to measure at home is set out. This article stays with how the system is put together.
The difference is the cup
A men's bra cup comes from one figure, the full chest minus the underbust. Subtract the second number from the first, and the remainder is the cup.
A cup describes how much the chest projects beyond the ribcage. A larger difference gives a deeper cup, and a smaller difference gives a shallower one. In this range the differences stay small, and that produces one cup letter.
| Difference (full chest minus underbust) | Result |
|---|---|
| About 1 to 2 inches | A cup |
| Under 1 inch | Below the standard cup; custom sizing cuts it to your two measurements |
Above that difference, most charts add a letter for every extra inch above A, although how size letters are standardized across countries varies. Those letters sit outside this range. The bras here are cut for A, which is where most male chests measure. A difference above about 2 inches is worth a question before an order, and a difference under about 1 inch sits below the standard cup. That is where custom sizing comes in. It covers both cases: the piece is drafted from your two numbers, and no new cup letter is added.
The cup letter varies with the band. A 34A and a 40A share a letter, but the cup is a different size, because the difference is measured against a different band. The letter states how much room sits in front of the ribcage, and the number states the ribcage it is built on.
Where US 34A-42A actually lands
Lace for Gentlemen makes bras for men in US 34A-42A. That is a grid of five sizes, five bands (34, 36, 38, 40, 42) crossed with one cup, A.
Here is what the range covers in practice.
- Bands run 34 to 42, taken straight from the underbust, a ribcage span of roughly 33 to 42 inches.
- One cup, A, runs through the range, and it fits a difference of about 1 to 2 inches between the full chest and the underbust.
- Clothing sizes M, L, XL, 3L and 4L map onto the same range, so a shirt size can point toward a band. It does not replace the underbust measurement.
- Custom sizing adjusts the fit, inside the range and outside it. When the underbust rounds awkwardly, or a cup sits a touch shallow or deep, the pattern is re-cut to those two numbers. The same applies when your numbers fall outside US 34A to 42A: the piece is drafted from your measurements rather than taken from a listed size.
Work one example through. A man measures 39 inches under the bust and 41 inches across the chest. The underbust rounds up to a 40 band. The difference is 2 inches, which sits inside the A range of about 1 to 2 inches. His size is 40A, set by the ribcage figure.
Most men who measure land here. A difference of about 1 to 2 inches points to A, the cup this range is cut for. A smaller difference sits below the standard cup, where custom sizing adjusts the fit. The ribcage sets the band, and the band is the variable. The same band can sit differently on two men, and custom sizing is where that difference is taken up.
A word on construction, since fit begins there. Each piece is drafted from its own block for the male body, with wider shoulders, a flatter sternum and a wider band. The fabric is sheer floral lace, 88% nylon and 12% spandex, with removable pads in an inner cup pocket, so the cup lies flat by design. Care is hand wash cold and dry flat, and how heat affects nylon and spandex is easy to see. Orders ship with free standard shipping, in plain, unbranded packaging, and how orders ship and are returned is set out on a separate page.
Three things that trip up sizing
Most men's bra sizing errors come from three assumptions, and none of the three moves the range of US 34A-42A. Each is easy to name once it is stated.
1. "A bra works only if there is a chest to fill it." The band does the holding. On a male chest the cup often lies almost flat, and that is expected. An A cup is cut shallow and wide, so it spreads across a broader, flatter chest. Nothing is missing from the cup, because the cup is cut to sit flat by design. A lace bra cut for the male chest is drafted from its own block. A scaled-up women's pattern keeps the wrong cup shape and only changes the numbers.
2. "Bra size follows height or weight." Neither decides the size on its own, and neither does shirt size. Two men of different heights, with the same ribcage, wear the same band. Body weight shifts both measurements. Only the two numbers set the size, so the method works the same for any body, and a shirt label such as XL is a starting hint at most.
3. "Custom sizing is only for sizes outside the range." It works both ways. Inside US 34A to 42A it adjusts a band that runs slightly snug or a cup cut a touch deeper; outside the range it is drafted from your two measurements, with no new cup letter. Either way the fabric stays the same, and the lead time is confirmed before cutting.
Two numbers settle the size. With the underbust and the full chest in hand, compare them against the range in stock. If anything is unclear, ask us by email. Fit questions get answered by email.
Common questions
The questions below come up most often, and the answers run from sizing and the A cup to the smallest size in the range, US 34A.
What bra size is a man?
A man's bra size comes from two measurements. The underbust sets the band, and the difference to the full chest sets the cup. Most male chests land in A, about 1 to 2 inches of difference, on bands from 34 to 42. Lace for Gentlemen makes these bras in US 34A-42A.
What size bra should a man wear?
His own size, read from two measurements. The underbust sets the band directly, with no plus-four correction, and the difference to the full chest sets the cup. Most male chests land in A, about 1 to 2 inches of difference, on bands from 34 to 42. A shirt size is only a hint.
Can a man wear a 34A?
Yes. A 34A pairs a 33-34 inch underbust with a full chest of about 35-36 inches. That is a band of 34 and a difference of about 1 to 2 inches, which gives an A cup. It sits near the smaller end of the range, and it is a standard size.
What is the smallest size in the range?
The line starts at a 34 band, cut for a full chest of about 35-36 inches. That is a 33-34 inch underbust. If the underbust measures below 33 inches, this range is likely to run large, and custom sizing can cut the band to your number instead.
The short version
A men's bra size comes from two numbers, and the line holds five sizes from 34A to 42A. The underbust sets the band, the full chest sets the cup, and the difference between them decides the letter. No standard men's size chart exists, because the band carries the size. The standard chart was never drawn to describe a flatter chest.
With the two measurements in hand, the rest is choosing a size that is already understood, five bands and one cup, and the ribcage figure that decides which one. Custom sizing adjusts a fit inside the range and covers sizes outside it.
Start with the numbers. The range they point to is the 34A-42A range. If the measurements sit between two sizes, or anything reads oddly, send the question first. We answer before a purchase, and it is a shorter conversation than a remake.
Designed for the Male Ribcage & Chest
Cut in US 34A to 42A from its own pattern. Handcrafted and made to order.
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