For the folds in the knee area, use the same method as before
Select the edges and apply Chamfer to duplicate them.
Adjust LPM cage to form the folds on the smoothed version.
Finish and check the adjustment with the parts against armour.
For ankle, nothing in particular is needed, just check the limits do not exceed the armour.
As for the knee, an even procedure with duplication of the edges.
And adjustment of the folds whilst viewing the model with Meshsmooth applied.
For the loincloth, start with a simple rectangle, this is a Shape Rectangle then converted into Mesh.
Extrude an edge to have 3 quadrangles.
Extrude like above while following the form.
Continue around and behind.
Extrude the fabric part in front and behind.
Apply Meshsmooth and finish the adjustments.