Same deal, different clothes: what a business suit is worth at the table
In 2014 two American researchers recruited 128 men from around San Francisco, put them in pairs, and asked them to negotiate the sale of a biotechnology manufacturing plant.
Each man played a chief financial officer. Each was given confidential information his counterpart did not have. The fair compromise price, if both sides split the difference honestly, was $20.5 million.
Before they sat down, each pair was randomly assigned what to wear. One group was given a black suit, a white button-down shirt and black leather dress shoes. Another was given a white t-shirt, blue sweatpants and plastic sandals. A third was simply left in whatever they had turned up in.
Nothing else changed. Same brief, same script, same information, same room.
What happened
The men in suits finished the negotiation $2.06 million above the fair price.
The men in sweatpants finished $0.68 million above it.
The men in their own clothes finished $0.66 million below it.
The concessions tell the same story from the other side. Over the course of the negotiation the men in suits gave away $0.83 million. The men in sweatpants gave away $2.81 million — very nearly two million dollars more, in a deal where they held identical cards.
The part that is easy to miss
The obvious reading is that a suit makes a man bolder. The study found something more interesting than that, and it is the reason this research is worth your attention rather than a magazine's.
The researchers were not only recording the outcome. They had both men wired to physiological sensors throughout.
The men negotiating against a suit showed a measurable stress response — vagal withdrawal and sympathetic nervous system activation, the pattern the body produces when it is assessing a threat rather than a peer. Their counterpart's clothing was doing something to their nervous system before either of them had conceded a dollar.
And the men in sweatpants showed a 20% drop in testosterone across the session. The men in suits showed essentially no change at all.
So the effect ran in both directions at once. The clothes altered how the wearer behaved, and they altered how the other man's body responded to him. Neither party could have told you that was happening.
What the study does not say
We would rather you were able to judge this evidence than simply take it from us, so here is the other side of it.
It was a role-play, not a real deal. No money changed hands. A man negotiating his own salary, with his own mortgage behind him, is under pressures this experiment did not reproduce.
It was 128 men aged 18 to 34, all in one region of California. That is a reasonable sample for this kind of work and a narrow one for drawing conclusions about a 55-year-old woman running a professional services firm in Southport.
The middle condition is genuinely odd. The men left in their own clothes performed worst of the three, below even the sweatpants group. The authors do not lean on that result and neither will we. It is a reminder that a single study is a data point, not a settled fact.
And most importantly for us: those were ordinary suits. Off-the-rack, black, unremarkable. The study did not compare a good suit to a poor one. It compared a suit to no suit. Anyone who cites this research as proof that bespoke tailoring is worth the money is stretching it further than it goes, and we are not going to do that.
There is also a broader caution worth knowing. The wider literature on how clothing changes behaviour has had a mixed record under scrutiny. The best-known experiment in it — the one where wearing a lab coat improved attention on a test — failed to reproduce when another team ran it again in 2019 under stricter conditions. A meta-analysis published in 2025 found the overall effect does hold up, though more modestly than the early headlines suggested. None of that sinks the negotiation study, which measured different things by different means. It does mean the honest position is interest rather than certainty.
What it does say
Stripped back to what it can carry, the finding is this: in a professional negotiation, what you are wearing changes the outcome, and it does so through channels neither party is aware of.
That is not a claim about status or about looking expensive. The suit condition did not win because it looked costly — the sensors were reading the other man's nervous system, not his opinion of the tailoring budget. It won because a suit in a business setting is legible. It tells the room, instantly and without a word, that the man wearing it understands the terms of the encounter he is in.
Which is precisely why the fit is the thing that matters, and why an ill-fitting suit can be worse than no suit at all. A jacket with the shoulder seam falling down the arm, sleeves swallowing the hand, a collar standing away from the neck — these do not read as formal. They read as borrowed. The garment is still saying something specific about the wearer; it is simply not the sentence he intended.
We have written separately about the perception research — including a study in which observers, shown five-second glimpses of the same man with his face obscured, rated him more favourably in a made-to-measure suit than in an off-the-peg one. Taken together, the two bodies of work point the same way. The suit is doing work. The fit determines what work it does.
How to tell whether yours is doing it
You do not need a tailor to check most of this. Standing in front of a mirror:
The shoulder. The seam should end where your shoulder ends. If it hangs past the bone, the jacket is too big, and no amount of taking in the waist will fix it — the shoulder is the one part of a jacket that cannot be meaningfully altered.
The collar. It should sit against your shirt collar and stay there when you move. A gap that opens when you walk means the balance of the jacket is wrong.
The sleeve. Roughly a centimetre of shirt cuff showing. This is the detail people register without knowing they have registered it.
The button. When you fasten the top button of a two-button jacket, the fabric should lie flat. An X-shaped pull radiating from the button means the jacket is closing under tension it was not cut for.
The trouser. One clean break over the shoe. Fabric pooling at the ankle is the single most common fault we see on suits that were otherwise well made.
If four of those five are right, you have a suit that is working for you. If three or more are wrong, you have a suit that is saying something you did not authorise it to say.
Kraus, M. W., & Mendes, W. B. (2014). Sartorial symbols of social class elicit class-consistent behavioral and physiological responses: A dyadic approach. Journal of Experimental Psychology: General, 143(6), 2330–2340. doi:10.1037/xge0000023
Where we come into it
We are a bespoke tailoring studio at Mermaid Beach, and most of what we make is business suiting for people on the Gold Coast who spend their working lives in rooms where they need to be taken at their word.
Every garment we make is designed here, in Australia, from a pattern drafted for one person from scratch — not a standard block adjusted at the edges. From there you have two options: made up by our partner workshops to our drawings, from $1,100, or cut and constructed on our own bench here, from $3,500. A first suit takes about five weeks. We will tell you which of the two makes sense for what you need, and we will tell you if the answer is neither.
