The smart T-shirt's stretchable fabric holds the sensors firmly in place - the elastic fibres are even used to measure breathing.

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Brooks Brothers decided to introduce a dressier button-down collar with a higher thread count and made with Italian-woven fabric in its Luxury shirt because sales staff had been getting requests from customers for such a shirt, he says.

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The shirt has six types of sensors woven into its fabric, and is able to monitor more than 40 signals from the wearer's body.

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If there is a gathering of fabric on the back or if there is excess shirt material hanging loosely off the front, you have to get the next size down.

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Men who choose a button-down shirt to wear with a suit and tie should consider a dressy fabric.

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When a person wearing the shirt applies pressure to the shirt's millimeter-thick cloth, the shirt captures the strength and location of the pressure with sensors sewn into its fabric and transmits the hug via Bluetooth to a cell phone.

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