Due to its position on the equator, Singapore is hot and humid all year round.
Dress codes in business reflect the climatic conditions and tend to be more informal than in many Western countries or even other Asian countries such as Japan and Korea.
Thus men will often wear shirt and trousers with no tie (jackets are not usually worn.) Colours can be lighter than the dark blues and greys of the UK and Japan.
Women tend to wear lightweight business suits. Accessories should be of good quality but not overly ostentatious.