I have only used doubled material in order to create costumes which look as though they are made with heavy period correct material, but as long as the two layers are aligned along the grain they seem to behave fairly well.

To make a thicker apron - which might be required in order to give the material enough body I'd have thought that it would only be necessary to fold the extra material behind the apron and sew the lower edges together, then shape the right edge by folding in the material as for shaping the left edge, or cut it if you want a fringe, then sew it a little way from the edge, adding another layer if you want multiple edges for the fringe.

Remember that the top edge of that (or any) infolding will not lie level with the top of the waist, but dip down, or if you try to pull it level the side of the apron will not be shaped but try to form a straight edge.

Anne the Pleater :ootd: