Business casual is an ambiguously defined Western dress code that is generally considered casual wear but with smart components of a proper lounge suit from traditional informal wear, adopted for white-collar workplaces. This interpretation typically including dress shirt and trousers, but worn with an odd-coloured blazer or a sports coat instead. Neck ties are optional in this category.

Western dress codes are a set of dress codes detailing what clothes are worn for what occasion. Conversely, since most cultures have intuitively applied some level equivalent to the more formal Western dress code traditions, these dress codes are simply a versatile framework, open to amalgamation of international and local customs. This versatility has made this scale of formality a practical international formality scale.