When it comes to formality in fashion, there's been a long-standing conflict around our waistlines: to tuck, or not to tuck. On the one hand, tucking in your shirt looks neat, tidy, and professional.

A French tuck, where only the front shirt hems are tucked in, gives a clean silhouette, elongates the legs, and adds waist definition. A side-tuck, where only one of the front shirt hems is tucked in, ...