Advance 2327

This is one of my favourite patterns- Advance 2327 from what I would guess is the mid/late 30's.  I am going to make this up one day just for the puffed tulip sleeves if nothing else.  What is interesting about the pattern itself however, is that the pattern layout asks for the skirt pieces to be pieced on doubled fabric, no matter what width of fabric, instead of cutting each out whole on an unfold piece.  Have you ever come across that before?  Is there a reason for it?

 

section of the pattern layout