Put the baseball pants on. If you decide that you want to wear them down around the ankles, make sure that they are long enough to cover the ankle, but not so long that they are dragging on the ground. If you want to wear them up high, you will have to work with them, so they do not keep falling down.
Pull the bottom of the pants up to the area just below the knee if you plan on wearing the pants high. Make sure that there is a lot of slack and excess fabric in the pants near the area where they are pulled up to.
Fold up the excess slack. Grab the fabric that is above the knee and fold it under the elastic of the pants. The slack should be folded several times between the elastic and your leg. Folding the excess fabric under will ensure that the pants fit snugly and that they are not baggy at all when pulled up.