Sport T-shirts have become one of the hardest-working garments in modern wardrobes, serving athletes, teams and brands at the same time. They carry a player's number at a weekend tournament, keep a gym member cool through an intense training session, and put a company logo in front of thousands of spectators at a charity run. Because these garments sit close to the skin, they must manage sweat, control odour and hold their shape after dozens of washes. They also have to look good in