Choosing the right size in a raincoat, especially a small for those with a more slender frame, ensures better mobility and comfort. A well-fitted raincoat will not only provide ample coverage from rain but will also allow for layering underneath without feeling bulky. When selecting a small raincoat, consider your body type and the fit. Many brands offer tailored cuts that enhance your silhouette while offering the practicality needed in a raincoat.