the main thing to keep in mind is that, if one area of fabric is folding, then the opposite end of it its typically pulled more taught. So if the fabric is folding in the crook of the arm when its being bent, then the fabric will be flat/unfolded on the elbow. If you’re not dealing with this sort of thing, then the thing to keep in mind is gravity and fabric weight. A heavy fabric that’s thin is going to have more folds than a heavy fabric that’s thick. Also the heavier the fabric, the more its going to be pulled towards the ground. This means that the folds are more likely to appear vertical and closer to the hem of the garment, where almost no folding will occur on the shoulders or hips (wherever the fabrics main support structure is).
A few good short cut to keep in mind are: 1) that softer, smoother fabric is better showcased with more folding, where a stiffer, thicker fabric is better shown with less folding 2) That more tailored fabric will be less wrinkled and folds will often be small and only in areas of gathering and tension, vs untailored garments will often have larger more awkward folds that showcase ill-fitting.
Honestly, if folds are cause u a problem, then spending lots of time studying drapery, whether its looking at models, street fashion or just people in a variety of types of clothing, is your best bet.