#25 DON’T WEAR SHORT-SLEEVE COLLARED SHIRTS
A collared shirt shouldn’t be short-sleeved. Sure, sometimes it gets too hot in a long-sleeve shirt and you need to get some breeze over your arms, in which case there’s nothing wrong with rolling up your long sleeves. Make a choice, though – short sleeve t-shirt, or long sleeve collared shirt. Don’t do the hybrid thing and turn off girls every girl in the office.