Dress shirts look much more professional when they're the right size for your frame. Use the brand's sizing chart to find a dress shirt that works well with your measurements. Then review the product's sizing notes to make sure you're choosing the right fit: Normal: Most men can easily wear a standard normal-fit dress shirt. Slim: If you have a trim build, a slim-fit dress shirt can provide a neat, clean fit that goes with suits or dress pants. Loose: If you're dressing for a casual occasion, a loose-fit shirt can offer easier movement and look less buttoned-up.