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Like the polo shirt, chinos or khakis (technically a colour, not a style) are one of the building blocks of business casual, and can be extended into the smart casual dress code

In more contemporary or creative settings, a well-cut blazer with tailored trousers and a considered shirt can meet the standard

Designed with a flattering V-neckline, airy bishop sleeves with smocked cuffs, and a streamlined silhouette that skims the figure

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So of course there were people back then who wore these popular dress styles - and their waists weren't 20 inches