By Liat Gat - Founder / June 20, 2020 Time to measure your feet! To know which size socks to make, use a tape measure and measure around the widest part (the ball) of your foot. Once you choose your size, go through the pattern and circle the numbers that apply to your size. To access this content, you must purchase June 2020 Toe-Up Socks Knitalong - FREE.