September 19, 2023 at 1:04 am #140732
Clothing and shoe sites have sizing charts. Usually they will illustrate how to take measurements (cloth tape measure is helpful for body measurements), then compare your measurements with the sizing charts.
Also, the thing about shoes is that open shoes (sandals) are more forgiving than shoes that are closed toe and heel. Open toes and open heels (or sling backs) can be a bit more forgiving if you are slightly bigger than a given size. They also have less structure than completely closed shoes.