Momo - from my days as an export manager, I was always of the opinion [and I stand to be corrected by those with more experience], that if in doubt, it is better to be 'over-dresed' than too casual.
Strangely enough, it is more difficult sometimes to decide the correct dress-code in the UK- eg ASDA went through a US 'dress-down' syndrome at one stage, and it was difficult to know if jeans or tie was the order of the day.
Towards the end of my days, I decided that I would take the middle road - jacket and tie, chinos/casual trousers - much easier for me and I offended no-one [I hope]
Sorry Mods - thread drift into fashonista territory.