Final answer:
The back hem of trousers should fall to the top of the shoe heel in the back, creating a slight break at the front. The length provides a clean line and should cover the shoe tops without dragging on the ground. Tailoring may be necessary for a precise fit.
Step-by-step explanation:
The back hem of trousers, also known as pants, should fall to the top of the shoe heel in the back, creating a slight break or bend at the front where the fabric meets the shoe. This is the conventional guideline for the proper length of men's trousers, often referred to as a 'medium break.' The trousers should be long enough in the back to cover the tops of the shoes, but not so long that they drag on the ground. In the past, different styles like a full break or no break at all have been popular, but the medium break is a timeless and professional look that works well for most occasions.
Trousers should have a clean line down the leg, and when shoes are worn, the hem should rest lightly on the shoe without creating a deep fold. The ideal length may also be influenced by personal preference and current fashion trends. For a more custom and precise fit, consulting a tailor is often the best course of action for hemming trousers.