When you parent a prop to a figure, it will assume the scaling of the parent figure. The best way to get those sandals to fit SP3 is moving and scaling them so that they fit, then export the sandals as .OBJ files. Two exports, one for the left sandal, and one for the right. Reimport them, unchecking all options on the import dialog. Now you can parent the sandals to SP3s feet. Save the left and right sandal separately to your props library. Poser will ask if you want to save them as smart props, choose yes. Getting both sandals to load simultaeous will require editing the PP2 files, there's no way to do it in Poser itself. I'd have to do some research on how to fix the .PP2 files to have both sandals load at the same time.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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