The best way to stretch leather shoes is to use a spray that is a mixture of water and isopropyl alcohol, also known as rubbing alcohol. Combine the ingredients in equal parts in a spray bottle.
Spray the mixture directly into the interior of the shoes, focusing on the areas that are extremely tight.
Once the shoes are completely dampened, wear the shoes around the house while wearing thick socks. As the shoes dry, they stretch and conform to the desired shape. For those who have sensitive feet and are unable to wear the alcohol soaked shoes throughout the drying process, stuff socks that are doused with the mixture into the shoes, and wait for them to dry.