Fit Problem: The Body
If a men's dress shirt isn't tailored properly through the torso and waist, it leaves excess fabric when tucked in. The least pardonable fit problem, "the muffin top". Only second to that, the parachute. Are you trying to escape the confines of your shirt? Parachuting happens when there is excess fabric in the back of the shirt.
These two problems change the appearance of the shirt and your stature from all angles. The excess fabric also interferes with the ability to layer. Don’t get swallowed by fabric, you deserve better.
Remember: Darts. They allow for dress shirts to taper at the waist or in the back. This means no excess fabric.