Shoes are 3D objects which you can adjust, as required, to fit the chosen avatar.
Shoes are not loaded by default, unless you have previously added them to the closet.
You need to add shoes to the closet before any display there. You can add your own shoe designs to the closet.
For more information, refer to Adding Shoes to the Closet.
If you open a VSP file with shoes, the shoes are added to the closet.