A delightful mixture between plaid and denim in this DSquared2 shirt
Place your foot on a piece of paper, while standing straight against a wall.
Draw a line along your heel and the longest part of your foot (repeat this with your other foot, because your feet might differ in length).
Measure the length between your heel and the longest part of both feet. This length in cm’s will correspond to your FP size in the size chart.