Medieval leather boots are typically available in various fit options, such as slim, medium, and wide, to accommodate different foot shapes. To determine the correct size, measure your feet in the late afternoon while wearing socks and add approximately 2 cm to the measurement of the longer foot for toe room. The slim-fit option is recommended for narrow feet, while those with wider or higher feet should opt for the wide-fit option. If in doubt, it's advisable to choose the larger size, as the leather will mold slightly to the foot over time.