Big IT company here
– Suited and booted if meeting customers I don’t know.
– Various stages of smart or smart casual for meeting customers I do know (depending largely on what they wear, or what we are going to be doing – meeting vs. actually working)
– In the office with no clients around – there aren’t any rules… generally I wear jeans, t-shirt and trainers, with a jumper if the ridiculous heating is ever turned down.
Lots of people dress in suits, but I can’t be arsed. There is a strong correlation between the ‘casually dressed’ and the ‘competent’. Beware the technical staff who are too dressed up, they tend to be compensating for a lack of skill (caveat: here at least, can’t speak for other workplaces).
Dave