Men living in Singapore wear coats and ties only at formal functions, but women do tend to dress a little more formally than in other countries. The prevalent Muslim and Hindu beliefs in Singapore require that women cover their arms, backs, and knees.
Prior to a meeting, it is customary to engage in social banter. During conversation, be enthusiastic, but try not to interrupt. Politeness is the single most important attribute in developing any kind of relationship in Singapore. Speak in low, modest tones and avoid standing with arms akimbo, which indicates aggression to many living in Singapore. Avoid gestures of any kind, as many may be considered offensive.

This is just a sample of what you'll find in the complete Singapore guide.